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PIV-SY-01 · SOLUTIONSNEET 2027 · Biology

Principles of Inheritance and Variation

Scientists & Years — Answer Key and Explanations

Questions
53 Max marks
212 Scope
Rationalised NCERT XII Ch. 4

Master reference — every dated name in the chapter

YearScientistContribution as stated in NCERT
1856 – 1863Gregor Johann MendelHybridisation experiments on garden pea (Pisum sativum) — seven years
1865Gregor Johann MendelPublished his work; remained unrecognised for ~35 years
1866Langdon DownFirst described Down’s syndrome
1891HenkingGerman biologist; traced and named the X body through spermatogenesis in insects — could not explain its significance
1900de Vries, Correns and von TschermakIndependently rediscovered Mendel’s results
1902Walter Sutton and Theodor BoveriChromosome behaviour parallels gene behaviour → Chromosomal Theory of Inheritance
—Thomas Hunt MorganExperimental verification using Drosophila melanogaster; coined linkage and recombination
—Alfred SturtevantUsed recombination frequency to measure gene distance and map gene positions
—Reginald C. PunnettBritish geneticist; the Punnett square
Answer Keymark before reading explanations
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Section ADirect recall — scientist and year
Q1Mendel · period
Mendel conducted his hybridisation experiments on garden pea during the period
  1. (a) 1856 – 1863
  2. (b) 1822 – 1856
  3. (c) 1865 – 1872
  4. (d) 1900 – 1907
ANSWER  (a)
WhyNCERT states Mendel conducted hybridisation experiments on garden pea for seven years, from 1856 to 1863.
Where it goes wrong1822 is Mendel’s birth year and 1884 his death year — neither is the experimental period.
Q2Mendel · duration
Mendel carried out his hybridisation experiments over a span of
  1. (a) five years
  2. (b) nine years
  3. (c) twelve years
  4. (d) seven years
ANSWER  (d)
Why1856 to 1863 inclusive is a seven-year span. NCERT states the figure explicitly.
Where it goes wrongCount the span, do not subtract 1863−1856 = 7 and then second-guess it.
Q3Mendel · publication
Mendel’s work on inheritance of characters was published in the year
  1. (a) 1856
  2. (b) 1866
  3. (c) 1865
  4. (d) 1900
ANSWER  (c)
WhyMendel presented and published his work in 1865. It went unrecognised for about 35 years.
Where it goes wrong1856 is when the experiments began; 1865 is publication.
Q4Down · year
Down’s syndrome was first described in the year
  1. (a) 1861
  2. (b) 1866
  3. (c) 1891
  4. (d) 1876
ANSWER  (b)
WhyLangdon Down first described the disorder in 1866.
Where it goes wrong1866 sits one year after Mendel’s 1865 publication — the two are routinely swapped.
Q5Down · name
The disorder now known as Down’s syndrome was first described by
  1. (a) Langdon Down
  2. (b) Theodor Boveri
  3. (c) Henking
  4. (d) Reginald Punnett
ANSWER  (a)
WhyLangdon Down described the condition in 1866; the syndrome carries his name.
Q6Henking · year
Henking traced a specific nuclear structure throughout spermatogenesis in certain insects in the year
  1. (a) 1901
  2. (b) 1902
  3. (c) 1881
  4. (d) 1891
ANSWER  (d)
WhyHenking made the observation in 1891.
Where it goes wrong1891 vs 1901 is a single-digit flip and the most common distractor in this cluster.
Q7Henking · X body
The nuclear structure observed by Henking during spermatogenesis was named by him as
  1. (a) Y body
  2. (b) Sex chromatin
  3. (c) X body
  4. (d) Barr body
ANSWER  (c)
WhyHenking could not explain the structure’s significance and simply labelled it the X body.
Where it goes wrongBarr body is a different concept entirely and belongs to a later context.
Q8Henking · nationality
Henking, who named the X body, was a
  1. (a) British geneticist
  2. (b) German biologist
  3. (c) Austrian monk
  4. (d) American embryologist
ANSWER  (b)
WhyNCERT identifies Henking as a German biologist.
Where it goes wrongPunnett is the British geneticist; Mendel the Austrian monk. Nationalities get shuffled between them.
Q9Rediscovery · year
Mendel’s results on inheritance of characters were rediscovered in the year
  1. (a) 1900
  2. (b) 1902
  3. (c) 1891
  4. (d) 1905
ANSWER  (a)
WhyThree scientists independently rediscovered Mendel’s results in 1900.
Where it goes wrong1900 = rediscovery. 1902 = chromosomal theory. This is the single highest-yield pair in the chapter.
Q10Rediscovery · trio
Mendel’s results on inheritance were rediscovered independently by
  1. (a) Sutton, Boveri and Morgan
  2. (b) Morgan, Sturtevant and Bridges
  3. (c) de Vries, Sutton and Punnett
  4. (d) de Vries, Correns and von Tschermak
ANSWER  (d)
WhyThe three rediscoverers in 1900 were de Vries, Correns and von Tschermak.
Where it goes wrongSutton and Boveri belong to 1902, not to the rediscovery.
Q11Chromosomal theory · year
The Chromosomal Theory of Inheritance was put forth in the year
  1. (a) 1900
  2. (b) 1891
  3. (c) 1902
  4. (d) 1910
ANSWER  (c)
WhySutton and Boveri united chromosome behaviour with gene behaviour in 1902.
Q12Chromosomal theory · authors
The Chromosomal Theory of Inheritance was proposed by
  1. (a) de Vries and Correns
  2. (b) Sutton and Boveri
  3. (c) Morgan and Sturtevant
  4. (d) Punnett and Bateson
ANSWER  (b)
WhyWalter Sutton and Theodor Boveri argued that chromosome behaviour parallels the behaviour of genes.
Where it goes wrongMorgan verified the theory experimentally; he did not propose it.
Q13Boveri · first name
The first name of Boveri, of Chromosomal Theory fame, is
  1. (a) Theodor
  2. (b) Walter
  3. (c) Alfred
  4. (d) Thomas
ANSWER  (a)
WhyTheodor Boveri. Walter belongs to Sutton, Alfred to Sturtevant, Thomas to Morgan.
Where it goes wrongAll four first names appear in this chapter attached to different surnames.
Q14Morgan · verification
Experimental verification of the chromosomal theory of inheritance was provided by
  1. (a) Walter Sutton
  2. (b) Hugo de Vries
  3. (c) Alfred Sturtevant
  4. (d) Thomas Hunt Morgan
ANSWER  (d)
WhyMorgan and his colleagues verified the theory using Drosophila melanogaster.
Q15Morgan · organism
Morgan carried out his experimental verification of the chromosomal theory using
  1. (a) Pisum sativum
  2. (b) Neurospora crassa
  3. (c) Drosophila melanogaster
  4. (d) Zea mays
ANSWER  (c)
WhyMorgan worked on the fruit fly, Drosophila melanogaster.
Where it goes wrongPisum sativum is Mendel’s garden pea.
Q16Morgan · terms
The terms ‘linkage’ and ‘recombination’ were coined by
  1. (a) Sturtevant
  2. (b) Morgan
  3. (c) Sutton
  4. (d) Punnett
ANSWER  (b)
WhyMorgan coined both terms while working out the behaviour of genes on the same chromosome.
Where it goes wrongSturtevant used recombination frequency; Morgan named it.
Q17Sturtevant · mapping
Gene positions were first mapped on a chromosome using recombination frequency by
  1. (a) Alfred Sturtevant
  2. (b) Thomas Hunt Morgan
  3. (c) Walter Sutton
  4. (d) Hugo de Vries
ANSWER  (a)
WhySturtevant used the frequency of recombination between gene pairs as a measure of the distance between them and mapped their positions.
Where it goes wrongMorgan is over-credited here in distractor sets. The maps are Sturtevant’s.
Q18Sturtevant · mentor
Alfred Sturtevant worked as a student under
  1. (a) Sutton
  2. (b) Boveri
  3. (c) Correns
  4. (d) Morgan
ANSWER  (d)
WhySturtevant was a student in Morgan’s group.
Q19Punnett · square
The graphical device used to calculate the probability of all possible genotypes of offspring is named after
  1. (a) Langdon Down
  2. (b) Hugo de Vries
  3. (c) Reginald C. Punnett
  4. (d) Walter Sutton
ANSWER  (c)
WhyThe Punnett square is named after Reginald C. Punnett.
Q20Punnett · nationality
Reginald C. Punnett was a
  1. (a) German biologist
  2. (b) British geneticist
  3. (c) Austrian monk
  4. (d) Dutch botanist
ANSWER  (b)
WhyNCERT describes Punnett as a British geneticist.
Where it goes wrongde Vries is the Dutch worker; Henking the German biologist.
Q21Mendel · gap
Mendel’s work remained unrecognised for approximately
  1. (a) 35 years
  2. (b) 10 years
  3. (c) 50 years
  4. (d) 20 years
ANSWER  (a)
WhyPublished in 1865 and rediscovered in 1900 — a gap of about 35 years.
Where it goes wrongThe arithmetic 1900 − 1865 = 35 is itself the answer; do not guess a round number.
Section BCorrectly / incorrectly matched pairs
Q22Pair · correct
Which of the following pairs is correctly matched?
  1. (a) Sutton and Boveri — 1900
  2. (b) Rediscovery of Mendel’s work — 1902
  3. (c) Langdon Down — 1865
  4. (d) Henking — 1891
ANSWER  (d)
WhyHenking’s X body observation is dated 1891. The other three all have the year displaced.
Q23Pair · incorrect
Which of the following pairs is incorrectly matched?
  1. (a) Mendel — 1865
  2. (b) Boveri — chromosomal theory
  3. (c) Morgan — construction of the first genetic map
  4. (d) Punnett — Punnett square
ANSWER  (c)
WhyThe first genetic map was constructed by Sturtevant, not Morgan. The remaining three pairs are correct.
Where it goes wrongRead the word incorrectly. Direction-of-question errors are a standing loss source.
Q24Pair · Correns
Which of the following is correctly matched?
  1. (a) Correns — chromosomal theory of inheritance
  2. (b) Correns — rediscovery of Mendel’s work
  3. (c) Correns — naming of the X body
  4. (d) Correns — linkage and recombination
ANSWER  (b)
WhyCorrens is one of the three 1900 rediscoverers, alongside de Vries and von Tschermak.
Q25Pair · contribution
Select the pair in which the scientist and his contribution are correctly associated.
  1. (a) Sturtevant — mapping of gene positions on a chromosome
  2. (b) Henking — discovery of sex determination in humans
  3. (c) Punnett — chromosomal theory of inheritance
  4. (d) de Vries — experiments on Drosophila
ANSWER  (a)
WhySturtevant mapped gene positions using recombination frequency.
Where it goes wrongHenking only named the X body — he explicitly could not explain its significance.
Q26Pair · odd one out
Which scientist is not associated with the 1900 rediscovery of Mendel’s work?
  1. (a) de Vries
  2. (b) Correns
  3. (c) von Tschermak
  4. (d) Boveri
ANSWER  (d)
WhyBoveri belongs to 1902 and the chromosomal theory. The other three are the rediscoverers.
Q27Match · years
Match the scientist with the year:
(i) Langdon Down  (ii) Henking  (iii) Sutton and Boveri  (iv) de Vries
  1. (a) (i) 1865, (ii) 1891, (iii) 1900, (iv) 1902
  2. (b) (i) 1866, (ii) 1901, (iii) 1902, (iv) 1900
  3. (c) (i) 1866, (ii) 1891, (iii) 1902, (iv) 1900
  4. (d) (i) 1868, (ii) 1891, (iii) 1900, (iv) 1902
ANSWER  (c)
WhyDown 1866, Henking 1891, Sutton and Boveri 1902, de Vries (rediscovery) 1900.
Where it goes wrongOptions b and d swap 1900 and 1902 — check that pair before anything else.
Q28Match · columns
Match Column I with Column II:
(i) Mendel  (ii) Morgan  (iii) Sturtevant  (iv) Punnett
(P) Genetic map  (Q) Garden pea  (R) Checkerboard  (S) Fruit fly
  1. (a) (i)–Q, (ii)–P, (iii)–S, (iv)–R
  2. (b) (i)–Q, (ii)–S, (iii)–P, (iv)–R
  3. (c) (i)–R, (ii)–S, (iii)–P, (iv)–Q
  4. (d) (i)–Q, (ii)–S, (iii)–R, (iv)–P
ANSWER  (b)
WhyMendel–garden pea, Morgan–fruit fly, Sturtevant–genetic map, Punnett–checkerboard (Punnett square).
Where it goes wrongOption b swaps the Morgan/Sturtevant credit — the standing trap in this chapter.
Section CChronology and intervals
Q29Chronology · four events
Arrange the following events in correct chronological order:
(i) Chromosomal theory of inheritance  (ii) Mendel’s publication  (iii) Naming of the X body  (iv) Rediscovery of Mendel’s work
  1. (a) (ii) → (iii) → (iv) → (i)
  2. (b) (ii) → (iv) → (iii) → (i)
  3. (c) (iii) → (ii) → (iv) → (i)
  4. (d) (ii) → (iii) → (i) → (iv)
ANSWER  (a)
Why1865 (publication) → 1891 (X body) → 1900 (rediscovery) → 1902 (chromosomal theory).
Where it goes wrongOption d reverses the final pair — rediscovery precedes the chromosomal theory by two years.
Q30Chronology · earliest
Which of the following events occurred earliest?
  1. (a) First description of Down’s syndrome
  2. (b) Naming of the X body by Henking
  3. (c) Publication of Mendel’s work
  4. (d) Start of Mendel’s hybridisation experiments
ANSWER  (d)
WhyMendel began his experiments in 1856, earlier than 1865, 1866 and 1891.
Q31Chronology · next event
Which event occurred immediately after the rediscovery of Mendel’s work?
  1. (a) Naming of the X body by Henking
  2. (b) First description of Down’s syndrome
  3. (c) Proposal of the chromosomal theory of inheritance
  4. (d) Publication of Mendel’s paper
ANSWER  (c)
WhyRediscovery 1900 was followed in 1902 by Sutton and Boveri’s chromosomal theory. The other three all predate 1900.
Q32Chronology · inequality
The correct ascending order of the following years, by the event associated with each, is
Henking’s X body, Down’s first description, Sutton and Boveri, Mendel’s publication
  1. (a) Down’s description < Mendel’s publication < Henking’s X body < Sutton and Boveri
  2. (b) Mendel’s publication < Down’s description < Henking’s X body < Sutton and Boveri
  3. (c) Mendel’s publication < Henking’s X body < Down’s description < Sutton and Boveri
  4. (d) Henking’s X body < Mendel’s publication < Down’s description < Sutton and Boveri
ANSWER  (b)
Why1865 < 1866 < 1891 < 1902.
Where it goes wrongInequality-direction errors are a confirmed recurring cluster — confirm the arrow points from small year to large.
Q33Chronology · interval
How many years separate Mendel’s publication from the proposal of the chromosomal theory of inheritance?
  1. (a) 37 years
  2. (b) 35 years
  3. (c) 40 years
  4. (d) 11 years
ANSWER  (a)
Why1902 − 1865 = 37 years.
Where it goes wrong35 years is the Mendel-to-rediscovery gap (1900−1865). Read which endpoint is asked.
Section DAssertion – Reason
Q34A–R · Mendel neglect
Assertion: Mendel’s work remained unrecognised until 1900.
Reason: Communication was not easy in Mendel’s time and his work could not be widely publicised.
  1. (a) Both A and R are true and R is the correct explanation of A
  2. (b) Both A and R are true but R is not the correct explanation of A
  3. (c) A is true but R is false
  4. (d) A is false but R is true
ANSWER  (a)
WhyBoth statements are true, and the difficulty of communication is precisely the reason NCERT gives for the neglect of Mendel’s work.
Q35A–R · chromosomal theory
Assertion: Sutton and Boveri put forth the chromosomal theory of inheritance in 1902.
Reason: They noted that the behaviour of chromosomes was parallel to the behaviour of genes.
  1. (a) Both A and R are true and R is the correct explanation of A
  2. (b) Both A and R are true but R is not the correct explanation of A
  3. (c) A is true but R is false
  4. (d) A is false but R is true
ANSWER  (a)
WhyBoth true, and the parallel behaviour is exactly the observation that led to the theory.
Where it goes wrongBoth parts true and causally linked — do not deny the link out of caution. That denial is a confirmed error pattern.
Q36A–R · Henking
Assertion: Henking is credited with naming the X body in 1891.
Reason: Henking established that the X body determines the sex of the offspring.
  1. (a) Both A and R are true and R is the correct explanation of A
  2. (b) Both A and R are true but R is not the correct explanation of A
  3. (c) A is true but R is false
  4. (d) A is false but R is true
ANSWER  (c)
WhyHenking did name the X body in 1891, so A is true. But NCERT states explicitly that he could not explain its significance — R is false.
Where it goes wrongThe reason overclaims. Henking named; he did not explain.
Q37A–R · Sturtevant
Assertion: Sturtevant was able to map the positions of genes on a chromosome.
Reason: The frequency of recombination between two genes serves as a measure of the distance between them.
  1. (a) Both A and R are true and R is the correct explanation of A
  2. (b) Both A and R are true but R is not the correct explanation of A
  3. (c) A is true but R is false
  4. (d) A is false but R is true
ANSWER  (a)
WhyBoth true, and the recombination-frequency principle is the basis on which the mapping was done.
Q38A–R · rediscovery
Assertion: Mendel’s results on inheritance were rediscovered in 1900 by three scientists.
Reason: de Vries, Correns and von Tschermak worked jointly on garden pea to confirm Mendel’s findings.
  1. (a) Both A and R are true and R is the correct explanation of A
  2. (b) Both A and R are true but R is not the correct explanation of A
  3. (c) A is true but R is false
  4. (d) A is false but R is true
ANSWER  (c)
WhyA is true. R is false on two counts — the three worked independently, not jointly.
Where it goes wrong‘Independently’ is the load-bearing word in the NCERT sentence.
Q39A–R · Morgan
Assertion: Morgan carried out the experimental verification of the chromosomal theory of inheritance.
Reason: Morgan proposed the chromosomal theory of inheritance in 1902.
  1. (a) Both A and R are true and R is the correct explanation of A
  2. (b) Both A and R are true but R is not the correct explanation of A
  3. (c) A is true but R is false
  4. (d) A is false but R is true
ANSWER  (c)
WhyA is true. R is false — the theory was proposed by Sutton and Boveri, not Morgan.
Where it goes wrongProposal and verification are different acts by different people.
Q40A–R · unrelated truths
Assertion: Langdon Down described Down’s syndrome in 1866.
Reason: Mendel published his work on inheritance of characters in 1865.
  1. (a) Both A and R are true and R is the correct explanation of A
  2. (b) Both A and R are true but R is not the correct explanation of A
  3. (c) A is true but R is false
  4. (d) A is false but R is true
ANSWER  (b)
WhyBoth statements are factually true, but the 1865 publication has no causal bearing on Down’s 1866 description.
Where it goes wrongTwo true statements sitting next to each other are not automatically linked.
Section EStatement-based and identification
Q41Statements · Mendel
Consider the following statements and select the correct option:
(i) Mendel conducted his experiments from 1856 to 1863.
(ii) Mendel’s work was published in 1865.
(iii) Mendel’s work was rediscovered in 1902.
  1. (a) (i) and (iii) are correct
  2. (b) (ii) and (iii) are correct
  3. (c) All three are correct
  4. (d) (i) and (ii) are correct
ANSWER  (d)
WhyStatements (i) and (ii) are correct. The rediscovery was in 1900, not 1902 — (iii) is wrong.
Q42Statements · Henking count
How many of the following statements are correct?
(i) Henking was a German biologist.
(ii) Henking observed the X body during spermatogenesis in insects.
(iii) Henking named the structure the X body.
(iv) Henking explained the significance of the X body.
  1. (a) Two
  2. (b) Four
  3. (c) Three
  4. (d) One
ANSWER  (c)
Why(i), (ii) and (iii) are correct. (iv) is false — NCERT states he could not explain its significance.
Q43Statements · absolute word
Which of the following statements is incorrect?
  1. (a) Mendel worked on garden pea for seven years.
  2. (b) The three scientists who rediscovered Mendel’s work always worked as a single research group.
  3. (c) Sutton and Boveri proposed the chromosomal theory in 1902.
  4. (d) Punnett was a British geneticist.
ANSWER  (b)
WhyThe rediscovery was made independently by the three workers. The word ‘always’ also flags this as the planted error.
Where it goes wrongAbsolute words — always, never, only — are a confirmed marker for the planted false statement.
Q44Statements · mixed pairs
Consider the following:
(i) Sutton and Boveri — 1902  (ii) Morgan — Drosophila  (iii) Sturtevant — genetic map  (iv) Henking — 1901
Which are correctly matched?
  1. (a) (i), (ii) and (iii)
  2. (b) (i), (ii) and (iv)
  3. (c) (ii), (iii) and (iv)
  4. (d) All four
ANSWER  (a)
WhyHenking’s observation dates to 1891, not 1901. The other three are correct.
Q45Statements · Mendel correct
Which one of the following statements about Mendel is correct?
  1. (a) He published his findings in 1856 and they were rediscovered in 1865.
  2. (b) He worked on Drosophila melanogaster for seven years.
  3. (c) His work was immediately accepted by the scientific community of his time.
  4. (d) He investigated characters in garden pea over a seven-year period beginning 1856.
ANSWER  (d)
WhyMendel worked on garden pea from 1856 for seven years. His work was published in 1865 and was not accepted in his lifetime.
Q46Identify · Henking
Identify the scientist from the description:
‘A German biologist who, in 1891, traced a specific nuclear structure throughout spermatogenesis in certain insects, but could not explain its significance.’
  1. (a) Boveri
  2. (b) Correns
  3. (c) Henking
  4. (d) von Tschermak
ANSWER  (c)
WhyThis is the NCERT description of Henking.
Where it goes wrongBoveri is also German-associated in students’ memory, which makes him the strongest distractor here.
Q47Identify · Sturtevant
Identify the scientist:
‘He used the frequency of recombination between gene pairs as a measure of the distance between genes and mapped their position on the chromosome.’
  1. (a) Morgan
  2. (b) Sturtevant
  3. (c) Sutton
  4. (d) Bateson
ANSWER  (b)
WhyThis is Sturtevant’s contribution as stated in NCERT.
Q48Rediscovery · independence
In the year 1900, three scientists rediscovered Mendel’s results. The correct statement about this is that they
  1. (a) worked independently of one another
  2. (b) worked together in a single laboratory
  3. (c) were all students of Mendel
  4. (d) each worked on Drosophila melanogaster
ANSWER  (a)
WhyNCERT specifies that the rediscovery was made independently by de Vries, Correns and von Tschermak.
Q49Counts · 1900 vs 1902
Which of the following correctly gives the number of scientists credited with each event?
(i) Rediscovery of Mendel’s work, 1900  (ii) Chromosomal theory, 1902
  1. (a) (i) two, (ii) three
  2. (b) (i) three, (ii) three
  3. (c) (i) two, (ii) two
  4. (d) (i) three, (ii) two
ANSWER  (d)
WhyThree rediscoverers in 1900 (de Vries, Correns, von Tschermak); two authors of the chromosomal theory in 1902 (Sutton, Boveri).
Where it goes wrongCounting the names is a fast way to eliminate wrong year–event pairings under time pressure.
Q50Pairs · same year
Which of the following pairs of scientists worked in the same year?
  1. (a) Sutton and Henking
  2. (b) Mendel and Langdon Down
  3. (c) de Vries and von Tschermak
  4. (d) Boveri and Correns
ANSWER  (c)
Whyde Vries and von Tschermak both feature in the 1900 rediscovery. Sutton is 1902 and Henking 1891; Mendel 1865 and Down 1866; Boveri 1902 and Correns 1900.
Q51Punnett · no year
The scientist whose name is attached to a widely used graphical method in genetics, rather than to a dated discovery, is
  1. (a) Henking
  2. (b) Punnett
  3. (c) Boveri
  4. (d) von Tschermak
ANSWER  (b)
WhyPunnett is cited in NCERT for the Punnett square, with no year attached to his name.
Q52Down · category
Which one of the following scientists is associated with a disorder rather than with a law, theory or technique?
  1. (a) Langdon Down
  2. (b) Walter Sutton
  3. (c) Hugo de Vries
  4. (d) Alfred Sturtevant
ANSWER  (a)
WhyLangdon Down is associated with Down’s syndrome, first described in 1866.
Q53Statements · Morgan scope
Read the statements:
(i) Morgan coined the term linkage.
(ii) Morgan coined the term recombination.
(iii) Morgan constructed the first genetic map.
Select the correct option.
  1. (a) (i) and (iii) only
  2. (b) (ii) and (iii) only
  3. (c) (i), (ii) and (iii)
  4. (d) (i) and (ii) only
ANSWER  (d)
WhyMorgan coined both linkage and recombination. The first genetic map was Sturtevant’s work.
Where it goes wrongThis is the same Morgan/Sturtevant boundary tested from a third angle — it is worth over-learning.
Solutions · PIV-SY-01Aamirah Fathima · NEET 2027