GATE BT Genetics and Evolutionary Biology PYQs & Answers

Questions 1–10 of 27. Imported answers require independent review unless marked reviewed.

Match the genetic disorders in Column I to the corresponding underlying cause in Column II

Column I: P. Klinefelter Syndrome; Q. Turner syndrome; R. Bloom syndrome; S. Xeroderma pigmentosum

Column II: 1. X-chromosome insufficiency; 2. DNA helicase mutations; 3. Nucleotide excision repair defects; 4. Extra X chromosome(s) in a male

Your answerChoose one option.

P-1; Q-3; R-4; S-2

P-4; Q-1; R-2; S-3

P-4; Q-2; R-3; S-1

P-3; Q-2; R-4; S-1

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The RNA sequence below depicts the part of a 330 nucleotides long mRNA and it encodes the C-terminal portion of a protein.

5′-… … … AAC ACC CGC CCU GUG GCG ACG UAG- 3′

A mutation was identified in this RNA, denoted as 322A→U. This nucleotide change is represented by which of the following class(es) of mutation?

Your answerSelect all correct options. You can choose more than one.

Missense mutation

Non-sense mutation

Transversion mutation

Silent mutation

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A disease-associated allele shows X-linked recessive inheritance. If the mother is a carrier of the disease, the father is genetically normal and the child born is a son, then the probability that he is born with the disease is _____. (rounded off to one decimal place)

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The allele associated with albinism in humans is recessive (c). The probability that an albino male (cc) and a carrier female (Cc) will have an offspring with normal skin pigmentation is _____ .

(Round off to one decimal place)

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The blood group of the mother is A⁺ and that of the father is AB⁺. Which of the following statements is/are correct?

Your answerSelect all correct options. You can choose more than one.

Probability of the offspring with A⁺ blood group is 0.5

Probability of the offspring with AB⁺ blood group is 0.125

Probability of the offspring with B⁺ blood group is 0.125

Probability of the offspring with O⁺ blood group is 0.375

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Mendel’s ‘law of segregation’ applies to the segregation of ________ during gamete formation.

Your answerChoose one option.

mitochondrial genes

alleles of a gene

linked genes on the same chromosome

unlinked genes on the same chromosome

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Match the genetic disorder (Column I) with its molecular basis (Column II).

Column I: P. Sickle-cell anemia Q. Xeroderma pigmentosum R. Tay-Sachs disease S. Down Syndrome

Column II:

Mutation in nucleotide excision repair

Trisomy of chromosome 21

Mutation in β-globin gene

Mutation in hexosaminidase A gene

Your answerChoose one option.

P-1; Q-4; R-2; S-3

P-3; Q-4; R-1; S-2

P-3; Q-1; R-4; S-2

P-4; Q-2; R-3; S-1

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The evolution of wings in bats and insects is an example of ______ evolution.

Your answerChoose one option.

convergent

divergent

neutral

parallel

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Determine the correctness or otherwise of the following Assertion [a] and the Reason [r].

Assertion [a]: Chromosome mutations can change the structure of chromosomes.

Reason [r]: All chromosome mutations arise due to nondisjunction of chromosomes during mitosis or meiosis.

Your answerChoose one option.

Both [a] and [r] are false

[a] is true but [r] is false

Both [a] and [r] are true and [r] is the correct reason for [a]

Both [a] and [r] are true but [r] is not the correct reason for [a]

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C-value paradox refers to

Your answerChoose one option.

the lack of correlation between genome size and genetic complexity of an organism

the presence of genetic sequences that propagate themselves within a genome

the coexistence of multiple alleles at a genetic locus

the concept that two or more genes may have the same function

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GATE BT Genetics and Evolutionary Biology PYQs

How to practice Genetics and Evolutionary Biology

Question 38

Question 43

Question 64

Question 30

Question 53

Question 16

Question 42

Question 43

Question 14

Question 15