Inheritance of Sex Flashcards

All 4 cards in this deck

What are the sex chromosomes of a human male and a human female?

Male: XY. Female: XX.

Which parent determines the sex of a child, and why?

The father — his sperm carry either an X or a Y chromosome, while all egg cells carry an X.

What is the probability that a child will be male?

0.5 / 50% / 1 in 2.

True or false? If a couple already have three daughters, their next child is more likely to be a boy.

False. Each fertilisation is independent, so the chance is still 50%.