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Question

A woman has only daughters. Which of the following is the suitable explanation for it?

A
The man produces sperms with either X and Y chromosomes but only the sperms with Y chromosomes are viable.
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B
The man produces sperms with either X and Y chromosomes but only the sperms with X chromosomes are viable.
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C
The man produces sperms with either X and Y chromosomes and all are viable.
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D
The man produces sperms that have only X chromosomes and all are viable.
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Solution

The correct option is D The man produces sperms with either X and Y chromosomes but only the sperms with X chromosomes are viable.
The sex of the child is determined at the time of fertilization when male and female gametes fuse to form a zygote. The gametes of males contain either the X chromosome or Y chromosome and the gametes of females contain only X chromosomes.
If a sperm carrying an X chromosome fertilizes an egg then the offspring will be a female child. This is because the offspring will have a XX combination of sex chromosomes. If a sperm carrying a Y chromosome fertilizes an egg then the offspring will be a male child. This is because the offspring will have an XY combination of sex chromosomes. You will find that the sex of the child is determined by the type of sperm that fuses with the egg at the time of fertilization.
If a woman has only daughters, it can be inferred that every time the male gamete having the X chromosome is fusing with the egg of the female. And therefore, the woman has only daughters.

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