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Hereditary and Variation MCQs for NEET — Botany Questions with Answers

Practice free Hereditary and Variation (Botany) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.

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Out of a pair of monozygotic twins, one develops hare lip and the other does not. This can be an example of the genetic phenomenon of:

A. Pleiotropy B. Incomplete penetrance C. Variable expressivity D. Incomplete dominance

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Explanation

In incomplete or reduced penetrance, some individuals will not express the trait even though they carry the allele.

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The mapping of genes on chromosome was attempted by

T. H. Morgan

Walter Sutton

Alfred Sturtevant

Henking

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Explanation

NCERT Page No. 83

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Today ________ are extensively used as a _______ point in the sequencing of whole genome

Pedigree charts, conclusive

Genetic maps, starting

Pedigree charts, starting

Genetic maps, conclusive

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Explanation

NCERT Page No. 84

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The initial studies for sex determination were done over

Plants

Insects

Humans

Hen

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Explanation

NCERT Page No. 85

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The concept of X body was given by

T. H. Morgan

Walter Sutton

Alfred Sturtevant

Henking

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Explanation

NCERT Page No. 85

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Among human males _______ chromosome is present but its counterpart is _____ and called ______ chromosome.

Y, bigger, Z

X, smaller, Z

X, smaller, Y

Z, bigger, X

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Explanation

NCERT Page No. 86

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In which of the following male heterogamety is not observed?

Insects

Birds

Humans

(1) and (2)

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Explanation

NCERT Page No. 86

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Which of the following statement is correct with respect to human sex determination?

The genetic makeup of egg determines the sex of child.

Female produces two types of ovums and males produce only one type of sperm.

Each pregnancy has more probability of male child than of female.

Out of 23 pairs of chromosomes, 22 are same both in males and females.

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Explanation

NCERT Page No. 86

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Mutation causes

alterations at protein level

changes in genotype only

changes in phenotype

both (2) and (3)

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Explanation

NCERT Page No. 87

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Sickle cell anaemia is a classic example of

Point mutation

silent mutation

Frame shift mutation

non sense mutation

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Explanation

NCERT Page No. 87

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