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Principles of Inheritance and Variation · Question 69

NEET 2016 (Phase 2)MCQEasy📈 Topic in 50% papers+4−1
1

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

Answer

(3) 0

Solution

Colour blindness is a sex-linked recessive trait (gene on the X chromosome).

Colour-blind man: XcY; homozygous normal woman: XX

⇒ Sons receive the Y chromosome from the father and an X chromosome from the mother.

∴ All sons are XY, i.e. normal; probability of a colour-blind son = 0

(All daughters are carriers, XcX.)

Answer: (3)

NEET 2016 (Phase 2)

Keep practising — Principles of Inheritance and Variation

2

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)
3

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)
4

Alleles are

  1. true breeding homozygotes
  2. different phenotype
  3. heterozygotes
  4. different molecular forms of a gene
AIPMT 2015 (Cancelled)
5

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)
6

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)
7

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)
8

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)
9

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
10

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
11

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

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All NEET Botany chapters
Class 11The Living WorldBiological ClassificationPlant KingdomMorphology of Flowering PlantsAnatomy of Flowering PlantsCell: The Unit of LifeCell Cycle and Cell DivisionTransport in PlantsMineral NutritionPhotosynthesis in Higher PlantsRespiration in PlantsPlant Growth and Development
Class 12Reproduction in OrganismsSexual Reproduction in Flowering PlantsPrinciples of Inheritance and VariationMolecular Basis of InheritanceStrategies for Enhancement in Food ProductionMicrobes in Human WelfareOrganisms and PopulationsEcosystemBiodiversity and ConservationEnvironmental Issues
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