Genetics and Inheritance Biology

JKPSC Assistant Professor (Zoology) · Zoology · 64 practice questions with answers and explanations: 8 Easy, 56 Medium, 0 Hard.

Sample questions

Sample Easy question 1

A Barr body is:

  1. A Y chromosome
  2. A mitochondrion
  3. A nucleolus
  4. An inactivated X chromosome
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Answer: D. Lyon's hypothesis explains random X inactivation in female somatic cells.

Sample Easy question 2

Sickle cell anaemia is caused by a substitution of valine for glutamic acid in the:

  1. β-chain of haemoglobin
  2. α-chain of haemoglobin
  3. Globin gene promoter
  4. Heme group
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Answer: A. A single base change GAG → GTG at position 6.

Sample Easy question 3

Who is called the Father of Genetics?

  1. Watson
  2. Gregor Mendel
  3. Thomas Morgan
  4. Hugo de Vries
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Answer: B. Mendel's pea experiments laid the base of genetics.

Sample Medium question 4

The giant chromosomes of Drosophila salivary glands are called:

  1. Ring chromosomes
  2. B chromosomes
  3. Lampbrush
  4. Polytene chromosomes
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Answer: D. They show bands and puffs.

Sample Medium question 5

Chromosome puffs (Balbiani rings) are sites of:

  1. Active transcription
  2. Crossing over
  3. Condensation
  4. Replication
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Answer: A. They are decondensed bands.

Sample Medium question 6

Klinefelter syndrome has the karyotype:

  1. 47, XXX
  2. 46, XY
  3. 45, X
  4. 47, XXY
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Answer: D. Males with an extra X chromosome.

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