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Principles of Inheritance and Variation · Question 67

NEET 2016 (Phase 1)MCQEasy📈 Topic in 50% papers+4−1
1

Which of the following most appropriately describes haemophilia ?

  1. Chromosomal disorder
  2. X-linked recessive gene disorder
  3. Dominant gene disorder
  4. Recessive gene disorder

Answer

(2) X-linked recessive gene disorder

Solution

As per NCERT, haemophilia is a sex-linked recessive disease; the gene for it lies on the X chromosome.

⇒ It is a Mendelian (gene) disorder, not a chromosomal disorder, and it is recessive.

∵ "Recessive gene disorder" is true but incomplete, the most appropriate description is "X-linked recessive gene disorder".

Answer: (2)

NEET 2016 (Phase 1)

Keep practising — Principles of Inheritance and Variation

2

The mechanism that causes a gene to move from one linkage group to another is called

  1. crossing-over
  2. translocation
  3. duplication
  4. inversion
NEET 2016 (Phase 2)
3

If a colour-blind man marries a woman who is homozygous for normal colour vision, the probability of their son being colour-blind is

  1. 0.75
  2. 0.5
  3. 0
  4. 1
NEET 2016 (Phase 2)
4

A true breeding plant is -

  1. produced due to cross-pollination among unrelated plants
  2. one that is able to breed on its own
  3. near homozygous and produces offspring of its own kind
  4. always homozygous recessive in its genetic constitution
Out of syllabusNEET 2016 (Phase 2)
5

The movement of a gene from one linkage group to another is called

  1. inversion
  2. translocation
  3. duplication
  4. crossing over
AIPMT 2015 (Cancelled)
6

Alleles are

  1. true breeding homozygotes
  2. different phenotype
  3. heterozygotes
  4. different molecular forms of a gene
AIPMT 2015 (Cancelled)
7

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)
8

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)
9

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)
10

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)
11

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

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