Question

Assertion (A): The male is not responsible for the sex of the baby (boy or girl) which is born.

Reason (R): A male has one X chromosome and one Y chromosome whereas a female has two X chromosomes. XX combinations of sex chromosomes leads to a baby girl but the XY combinations of sex chromosomes leads to a baby boy.

Options

• Both A and R are true and R is correct explanation of the assertion.

• Both A and R are true but R is not the correct explanation of the assertion.

• A is true but R is false.

• A is false but R is true.

Answer 1

A is false but R is true.

Explanation:

The male determines the sex of the child because the female always produces eggs carrying an X chromosome, whereas the male produces sperm carrying either an X or a Y chromosome. Fertilization by an X-bearing sperm results in a girl (XX), while fertilization by a Y-bearing sperm results in a boy (XY). Therefore, Assertion (A) is false.

A human male has one X and one Y chromosome (XY), whereas a female has two X chromosomes (XX). The XX combination produces a girl and the XY combination produces a boy. Therefore, Reason (R) is true.

Hence, A is false but R is true.