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Principles of Inheritance and Variation · Question 72

AIPMT 2015 (Cancelled)MCQEasy📈 Topic in 38% papers+4−1
1

Alleles are

  1. true breeding homozygotes
  2. different phenotype
  3. heterozygotes
  4. different molecular forms of a gene

Answer

(4) different molecular forms of a gene

Solution

As per NCERT, genes which code for a pair of contrasting traits are known as alleles, i.e. they are slightly different forms of the same gene (e.g. T and t for height).

⇒ Alleles are different molecular forms of a gene occupying the same locus on homologous chromosomes.

Answer: (4)

AIPMT 2015 (Cancelled)

Keep practising — Principles of Inheritance and Variation

2

Multiple alleles are present

  1. on different chromosomes
  2. at the same locus of the chromosome
  3. at different loci on the same chromosome.
  4. on non-sister chromatids
AIPMT 2015 (Cancelled)
3

A man with blood group ‘A’ marries a woman with blood group ‘B’. What are all the possible blood groups of their offsprings?

  1. A and B only
  2. A, B, AB and O
  3. A, B and AB only
  4. O only
AIPMT 2015 (Cancelled)
4

How many pairs of contrasting characters in pea plants were studied by Mendel in his experiments?

  1. Eight
  2. Five
  3. Seven
  4. Six
AIPMT 2015 (Cancelled)
5

An abnormal human baby with ‘XXX’ sex chromosomes was born due to

  1. formation of abnormal sperms in the father
  2. fusion of two ova and one sperm
  3. formation of abnormal ova in the mother
  4. fusion of two sperms and one ovum
AIPMT 2015 (Cancelled)
6

Select the incorrect statement with regard to Haemophilia :

  1. It is a dominant disease
  2. A single protein involved in the clotting of blood is affected
  3. It is a recessive disease
  4. It is a sex-linked disease
NEET 2013
7

If both parents are carriers for thalassemia, which is an autosomal recessive disorder, what are the chances of pregnancy resulting in an affected child ?

  1. 100%
  2. 25%
  3. no chance
  4. 50%
NEET 2013
8

If two persons with 'AB' blood group marry and have sufficiently large number of children, these children could be classified as 'A' blood group : 'AB' blood group : 'B' blood group in 1 : 2 : 1 ratio. Modern technique of protein electrophoresis reveals presence of both 'A' and 'B' type proteins in 'AB' blood group individuals. This is an example of :

  1. Codominance
  2. Partial dominance
  3. Incomplete dominance
  4. Complete dominance
NEET 2013
9

Which idea is depicted by a cross in which the F1 generation resembles both the parents?

  1. law of dominance
  2. co-dominance
  3. incomplete dominance
  4. inheritance of one gene
NEET 2013
10

Which of the following statements is not true of two genes that show 50% recombination frequency ?

  1. The genes are tightly linked
  2. The genes show independent assortment
  3. If the genes are present on the same chromosome, they undergo more than one crossovers in every meiosis.
  4. The genes may be on different chromosomes
NEET 2013
11

In our society women are blamed for producing female children. Choose the correct answer for the sex-determination in humans.

  1. Due to some defect like aspermia in man
  2. Due to the genetic make up of the particular sperm which fertilizes the egg
  3. Due to the genetic make up of the egg
  4. Due to some defect in the women
NEET 2013 (Karnataka)

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