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Principles of Inheritance and Variation · Question 77

NEET 2013MCQEasy📈 Topic in 50% papers+4−1
1

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

Answer

(1) It is a dominant disease

Solution

As per NCERT, haemophilia is a sex-linked recessive disease which is transmitted from an unaffected carrier female to some of the male progeny.

⇒ In this disease, a single protein that is a part of the cascade of proteins involved in clotting of blood is affected.

∴ Statements (2), (3) and (4) are correct; haemophilia is not a dominant disease.

Answer: (1)

NEET 2013

Keep practising — Principles of Inheritance and Variation

2

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
3

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
4

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
5

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
6

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)
7

Which one is the incorrect statement with regards to the importance of pedigree analysis?

  1. It confirms that DNA is the carrier of genetic information
  2. It helps to trace the inheritance of a specific trait
  3. It confirms that the trait is linked to one of the autosome
  4. It helps to understand whether the trait in question is dominant or recessive
NEET 2013 (Karnataka)
8

Down's syndrome in humans is due to :

  1. Three 'X' chromosomes
  2. Monosomy
  3. Three copies of chromosome 21
  4. Two 'Y' chromosomes
NEET 2013 (Karnataka)
9

Represented below is the inheritance pattern of a certain type of traits in humans. Which one of the following conditions could be an example of this pattern ? [figure]

  1. Haemophilia
  2. Sickle cell anaemia
  3. Thalassemia
  4. Phenylketonuria
AIPMT 2012 (Mains)
10

A test cross is carried out to :

  1. Determine whether two species or varieties will breed successfully
  2. Determine the genotype of a plant at F2
  3. Predict whether two traits are linked
  4. Assess the number of alleles of a gene
AIPMT 2012 (Mains)
11

Which one of the following is a wrong statement regarding mutations ?

  1. UV and gamma rays are mutagens
  2. Deletion and insertion of base pairs cause frame-shift mutations
  3. Cancer cells commonly show chromosomal aberrations
  4. Change in a single base pair of DNA does not cause mutation
AIPMT 2012 (Mains)

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