1. The maleness of a child is determined by (a) the X chromosome in the zygote (b) the Y chromosome in the zygote (c) the cytoplasm of the germ cell, which determines the sex sex is determined by chance

• Soln:

The answer is (b) the Y chromosome in the zygote

Explanation:

If sperm with a Y chromosome fertilises the egg, the zygote will develop into a male child. If sperm with an X chromosome fertilises the egg, the zygote will develop into a female child.