Question

A zygote which has an X-chromosome inherited from the father will develop into a
(a) boy
(b) girl
(c) X- chromosome does not determine the sex of a child
(d) either boy or girl

NCERT Class X
Science - Exemplar Problems

Chapter_Heredity and Evolution

Answer 1

Sex of a Zygote is determined by what they inherint from their father.

All children whether boys or girls will inherent X chromosome from their mother.

A child who inherits X chromosome from father will be XX girl child.

And one who inherits Y chromosome from father will be a BoyXY.

So Answer is option B : Girl.

Answer 2

Answer:- (b)Girl

Explanation:- Sex is determined by different factors in various species. In human beings, the sex of the child depends on whether the paternal chromosome is X(for girls) or Y(for boys).

Women have perfect pair of sex chromosomes i.e. XX but Male have mismatched pair i.e. XY.

All children will inherit an X chromosome from their mother and thus the sex of the children will be determined by what they inherit from their father.

A child who inherits X from father will be a girl, and one who inherits a Y from father will be a girl.

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