Which one of the following conditions of the | vedclass

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(A) The correct answer is $A$. In humans,the female has a pair of $X$ chromosomes ($XX$ - homogametic composition),and the male has $XY$ chromosomes (

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Two $X$ chromosomes

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(A) The correct answer is $A$. In humans,the female has a pair of $X$ chromosomes ($XX$ - homogametic composition),and the male has $XY$ chromosomes (heterogametic composition).During fertilization,the fusion of an egg (containing an $X$ chromosome) with a sperm (containing an $X$ chromosome) results in a zygote with two $X$ chromosomes $(XX)$.This $XX$ chromosomal constitution in the zygotic cell leads to the development of a normal human female child.

Which one of the following conditions of the zygotic cell would lead to the birth of a normal human female child?

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Assertion : In humans,the gamete contributed by the male determines whether the child produced will be male or female.
Reason : Sex in humans is a polygenic trait depending upon a cumulative effect of some genes on $X-$ chromosome and some on $Y-$ chromosome.

Explain the $XO$ and $XY$ types of sex determination.

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