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Principles of Inheritance and Variation · Question 49

NEET (UG) 2019MCQEasy📈 Topic in 50% papers+4−1
1

In Antirrhinum (Snapdragon), a red flower was crossed with a white flower and in F1 generation, pink flowers were obtained. When pink flowers were selfed, the F2 generation showed white, red and pink flowers. Choose the incorrect statement from the following :

  1. Ratio of F2 is 14 (Red) : 24 (Pink) : 14 (White)
  2. Law of Segregation does not apply in this experiment
  3. This experiment does not follow the Principle of Dominance
  4. Pink colour in F1 is due to incomplete dominance

Answer

(2) Law of Segregation does not apply in this experiment

Solution

Red (RR) White (rr) F1 Rr = Pink (incomplete dominance).

Selfing Rr Rr F2 = 1 RR (Red) : 2 Rr (Pink) : 1 rr (White) = 14 : 24 : 14.

As per NCERT, in incomplete dominance the phenotypic ratio deviates from 3 : 1, but the genotypic ratio remains 1 : 2 : 1 as in any Mendelian monohybrid cross; the alleles still separate during gamete formation.

The Law of Segregation does apply; only the Principle of Dominance is not followed.

Hence, statement (2) is incorrect.

Answer: (2)

NEET (UG) 2019

Keep practising — Principles of Inheritance and Variation

2

What map unit (Centimorgan) is adopted in the construction of genetic maps?

  1. A unit of distance between genes on chromosomes, representing 1\% cross over.
  2. A unit of distance between genes on chromosomes, representing 50\% cross over.
  3. A unit of distance between two expressed genes, representing 10\% cross over.
  4. A unit of distance between two expressed genes, representing 100\% cross over.
NEET (UG) 2019
3

What is the genetic disorder in which an individual has an overall masculine development, gynaecomastia, and is sterile?

  1. Edward syndrome
  2. Down’s syndrome
  3. Turner’s syndrome
  4. Klinefelter’s syndrome
NEET (UG) 2019
4

Select the incorrect statement.

  1. In domesticated fowls, sex of progeny depends on the type of sperm rather than egg.
  2. Human males have one of their sex-chromosome much shorter than the other.
  3. Male fruit fly is heterogametic
  4. In male grasshoppers, 50\% of sperms have no sex-chromosome.
NEET (UG) 2019
5

Which of the following pairs is wrongly matched?

  1. Starch synthesis in pea : Multiple alleles
  2. ABO blood grouping : Co-dominance
  3. XO type sex determination: Grasshopper
  4. T.H. Morgan : Linkage
NEET 2018
6

Which of the following characteristics represent 'Inheritance of blood groups' in humans?

  1. B, C and E only
  2. A, B and C only
  3. B, D and E only
  4. A, C and E only
NEET 2018
7

A woman has an X-linked condition on one of her X chromosomes. This chromosome can be inherited by

  1. only daughters
  2. only sons
  3. only grandchildren
  4. both sons and daughters
NEET 2018
8

Select the correct statement :

  1. Franklin Stahl coined the term “linkage”.
  2. Punnett square was developed by a British scientist.
  3. Spliceosomes take part in translation.
  4. Transduction was discovered by S. Altman.
NEET 2018
9

Thalassemia and sickle cell anemia are caused due to a problem in globin molecule synthesis. Select the correct statement.

  1. Both are due to a qualitative defect in globin chain synthesis
  2. Thalassemia is due to less synthesis of globin molecules
  3. Sickle cell anemia is due to a quantitative problem of globin molecules
  4. Both are due to a quantitative defect in globin chain synthesis
NEET 2017
10

The genotypes of a Husband and Wife are IAIB and IAi. Among the blood types of their children, how many different genotypes and phenotypes are possible?

  1. 4 genotypes ; 3 phenotypes
  2. 4 genotypes ; 4 phenotypes
  3. 3 genotypes ; 4 phenotypes
  4. 3 genotypes ; 3 phenotypes
NEET 2017
11

A disease caused by an autosomal primary non-disjunction is :

  1. Klinefelter's Syndrome
  2. Down's Syndrome
  3. Turner's Syndrome
  4. Sickle Cell Anemia
NEET 2017

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