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Question

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


A

Only one Y chromosome

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B

Two X chromosomes

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C

One X and one Y chromosome

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D

Only one X chromosome

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Solution

The correct option is B

Two X chromosomes


The correct option is B.

Explanation of the correct option:

  1. Females have two X chromosomes at birth (XX).
  2. Males have two chromosomes, one X and one Y.

Explanation of the incorrect option:

OPTION A :

Swyer syndrome patients have one X chromosome and one Y chromosome in each cell would be the typical pattern discovered in boys and men; however, those who have female reproductive structures.

OPTION C :

Males with one X and one Y chromosome now have only one Y chromosome, whereas females have two.

OPTION D :

Turner syndrome affects exclusively women and occurs when one of the X chromosomes (sex chromosomes) is missing or partially missing.

Final Answer: Two X chromosomes would lead to the birth of a normal human female child.


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