Question

Which of the following is true regarding the role of parents in sex determination?

Options

• Sex is determined randomly during embryonic development

• The father's X or Y chromosome determines the sex of the child

• The mother's chromosomes determine the sex of the child

• Both parents equally determine the sex of the child

Answer 1

The father's contribution determines the sex of the child because the mother always contributes an X chromosome, while the father contributes either an X (resulting in a female XX) or a Y (resulting in a male XY). Thus, it is the father's chromosome that is the determining factor.