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Principles of Inheritance and Variation · Question 129

AIPMT 2005MCQMedium📈 Topic in 50% papers+4−1
1

A woman with normal vision, but whose father was colour blind, marries a colour blind man. Suppose that the fourth child of this couple was a boy. This boy -

  1. May be colour blind or may have normal vision
  2. Must have normal colour vision
  3. Must be colour blind
  4. Will be partially colour blind since he is heterozygous for the colour blind mutant allele.

Answer

(1) May be colour blind or may have normal vision

Solution

∵ Her father was colour blind ( XcY) ⇒ the woman with normal vision is a carrier: XCXc.

⇒ Husband is colour blind: XcY.

⇒ A son gets his Y from the father and one X from the mother: XCY (normal) or XcY (colour blind), each with probability 12.

∴ Every son, whatever his birth order, may be colour blind or may have normal vision. (A male is hemizygous, so he can never be heterozygous.)

Answer: (1)

AIPMT 2005

Keep practising — Principles of Inheritance and Variation

2

A woman with 47 chromosomes due to three copies of chromosome 21 is characterized by

  1. triploidy
  2. Down’s syndrome
  3. superfemaleness
  4. Turner’s syndrome
AIPMT 2005
3

In a plant, red fruit (R) is dominant over yellow fruit (r) and tallness (T) is dominant over shortness (t). If a plant with RRTt genotype is crossed with a plant that is rrtt

  1. 75% will be tall with red fruit
  2. 25% will be tall with red fruit
  3. 50% will be tall with red fruit
  4. All the offspring will be tall with red fruit
AIPMT 2004
4

A male human is heterozygous for autosomal genes A and B and is also hemizygous for hemophilic gene h. What proportion of his sperms will be abh?

  1. 1/16
  2. 1/32
  3. 1/8
  4. 1/4
AIPMT 2004
5

Lack of independent assortment of two genes A and B in fruit fly Drosophila is due to

  1. Linkage
  2. Recombination
  3. Repulsion
  4. Crossing over
AIPMT 2004
6

One of the parents of a cross has a mutation in its mitochondria. In that cross, that parent is taken as a male. During segregation of F2 progenies that mutation is found in -

  1. 50% of the progenies
  2. 1/3 of the progenies
  3. None of the progenies
  4. All the progenies
AIPMT 2004
7

A normal woman, whose father was colour-blind is married to a normal man. The sons would be :-

  1. All colour-blind
  2. 75% colour-blind
  3. All normal
  4. 50% colour-blind
AIPMT 2004
8

The recessive genes located on X-chromosomes in humans are always -

  1. Expressed in females
  2. Sub-lethal
  3. Expressed in males
  4. Lethal
AIPMT 2004
9

After a mutation at a genetic locus the character of an organism changes due to the change in :-

  1. Protein synthesis pattern
  2. RNA transcription pattern
  3. DNA replication
  4. Protein structure
AIPMT 2004
10

In a mutational event, when adenine is replaced by guanine, it is a case of -

  1. Frameshift mutation
  2. Transition
  3. Transversion
  4. Transcription
AIPMT 2004
11

Which one of the following traits of garden pea studied by Mendel was a recessive feature?

  1. Green seed colour
  2. Green pod colour
  3. Axial flower position
  4. Round seed shape
AIPMT 2003

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