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NEET Practice Questions (MCQs) with Answers & Solutions

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All Physics Chemistry Botany Zoology

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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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In which of the following one may observe variation in DNA?

Fragmentation

Budding

Amitosis

mutation

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Explanation

NCERT Page No. 87

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If a normal female has a sickle cell anaemic child what can be the probable genotype of that gene in that female?

both (1) and (3)

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Explanation

Concept NCERT Page No. 89

Sickle cell anaemia means genotype is “aa” and in order to carry both alleles as “a” from normal parents the parents have to be heterozygous, so the mother would be carrying “Aa”.

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If the female has three boys in her first three pregnancy. What are the chances of getting female child this time?

25%

50%

75%

20%

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Explanation

Concept - NCERT Page No. 86

The chances of having a baby boy or girl will always be ½ ie. It does not vary with past pregnancies.

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