Which of the following statements is incorrect?

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The sex chromosomes of the father determine the sex of an unborn baby.

The mother is responsible for the sex of her baby.

Sperms are of two kinds, one kind has an X chromosome, and the other kind has a Y chromosome.

The gametes (egg and sperm) have only one set of chromosomes.

answer is B.

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Detailed Solution

The statement, "The mother is responsible for the sex of her baby" is incorrect.

The sex chromosomes of the father determine the sex of an unborn baby. The sperm of the father are of two kinds, one kind has an X chromosome, and the other kind has a Y chromosome. The Y-chromosome is responsible for a male child while X-chromosome is responsible for a female child.

Thus, if a sperm with Y-chromosome fuses with the egg then the zygote will form a male child whereas, a sperm with an X-chromosome fusing with the egg will form a female child.

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