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Principles of Inheritance and Variation · Question 131

AIPMT 2004MCQEasy📈 Topic in 38% papers+4−1
1

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

Answer

(3) 50% will be tall with red fruit

Solution

Cross: RRTt × rrtt

Gametes of RRTt: RT, Rt (1 : 1); gametes of rrtt: rt only.

⇒ Offspring: RrTt (red, tall) and Rrtt (red, short) in the ratio 1 : 1.

⇒ Fruit colour: RR × rr ⇒ all Rr ⇒ 100% red.

⇒ Height: Tt × tt ⇒ 1/2 Tt (tall) : 1/2 tt (short).

∴ Tall with red fruit = 1 12 = 12 = 50%.

Answer: (3)

AIPMT 2004

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2

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
3

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
4

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
5

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
6

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
7

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
8

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
9

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
10

The genes controlling the seven pea characters studied by Mendel are now known to be located on how many different chromosomes?

  1. Six
  2. Seven
  3. Five
  4. Four
AIPMT 2003
11

Two crosses between the same pair of genotypes or phenotypes in which the sources of the gametes are reversed in one cross, is known as:

  1. Reciprocal cross
  2. Reverse cross
  3. Test cross
  4. Dihybrid cross
AIPMT 2003

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