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Principles of Inheritance and Variation · Question 33

NEET (UG) 2022MCQEasy📈 Topic in 38% papers+4−1
1

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). In the light of the above statements, choose the correct answer from the options given below :

  1. Both (A) and (R) are correct and (R) is the correct explanation of (A)
  2. Both (A) and (R) are correct but (R) is not the correct explanation of (A)
  3. (A) is correct but (R) is not correct
  4. (A) is not correct but (R) is correct

Answer

(3) (A) is correct but (R) is not correct

Solution

As per NCERT, Morgan found that when two genes in a dihybrid cross are situated on the same chromosome, the proportion of parental gene combinations is much higher than the non-parental type. He attributed this to the physical association or linkage of the two genes.

∴ Genes located closely on the same chromosome are tightly linked and are inherited together; they do not follow the law of independent assortment ⇒ Assertion (A) is correct.

∵ Closely located genes are linked, they do not assort independently ⇒ Reason (R) is not correct.

Answer: (3)

NEET (UG) 2022

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2

If a colour blind female marries a man whose mother was also colour blind, what are the chances of her progeny having colour blindness?

  1. 25%
  2. 50%
  3. 75%
  4. 100%
NEET (UG) 2022
3

The recombination frequency between the genes a & c is 5%, b & c is 15%, b & d is 9%, a & b is 20%, c & d is 24% and a & d is 29%. What will be the sequence of these genes on a linear chromosome?

  1. a, d, b, c
  2. d, b, a, c
  3. a, b, c, d
  4. a, c, b, d
NEET (UG) 2022
4

Given below are two statements: In the light of the above statements, choose the correct answer from the options given below :

  1. Statement I is incorrect but Statement II is correct
  2. Both Statement I and Statement II are correct
  3. Both Statement I and Statement II are incorrect
  4. Statement I is correct but Statement II is incorrect
NEET (UG) 2022 (Phase 2)
5

The chromosomal theory of inheritance was proposed by

  1. Robert Brown
  2. Thomas Morgan
  3. Sutton and Boveri
  4. Gregor Mendel
NEET (UG) 2022 (Phase 2)
6

What is the expected percentage of F2 progeny with yellow and inflated pod in dihybrid cross experiment involving pea plants with green coloured, inflated pod and yellow coloured constricted pod?

  1. 9%
  2. 100%
  3. 56.25%
  4. 18.75%
NEET (UG) 2022 (Phase 2)
7

If a female individual is with small round head, furrowed tongue, partially open mouth and broad palm with characteristic palm crease. Also the physical, psychomotor and mental development is retarded. The karyotype analysis of such an individual will show :

  1. Trisomy of chromosome 21
  2. 47 chromosomes with XXY sex chromosomes
  3. 45 chromosomes with XO sex chromosomes
  4. 47 chromosomes with XYY sex chromosomes
NEET (UG) 2022 (Phase 2)
8

Select the incorrect match regarding the symbols used in the Pedigree analysis:

  1. [figure] – Parent with male child affected with disease
  2. [figure] – Sex unspecified
  3. [figure] – Affected individual
  4. [figure] – Consanguineous mating
NEET (UG) 2022 (Phase 2)
9

A normal girl, whose mother is haemophilic marries a male with no ancestral history of haemophilia. What will be the possible phenotypes of the offspring? Choose the most appropriate answer from the options given below:

  1. B and D only
  2. A and B only
  3. B and C only
  4. A and D only
NEET (UG) 2022 (Phase 2)
10

The production of gametes by the parents, formation of zygotes, the F1 and F2 plants, can be understood from a diagram called :

  1. Net square
  2. Bullet square
  3. Punch square
  4. Punnett square
NEET (UG) 2021
11

In a cross between a male and female, both heterozygous for sickle cell anaemia gene, what percentage of the progeny will be diseased?

  1. 100%
  2. 50%
  3. 75%
  4. 25%
NEET (UG) 2021

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