Sex Determination Flashcards

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Note: We may include questions that have multiple correct answers. It's useful to remember specific examples to understand these concepts better.

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What do we call the pair of chromosomes that decide if a person is male or female?

They are called sex chromosomes.

How many pairs of chromosomes does a human body cell have, and which pair are the sex chromosomes?

A human body cell has 23 pairs of chromosomes. The 23rd pair are the sex chromosomes.

What sex chromosomes does a human female have?

A human female has two X chromosomes, written as XX.

What sex chromosomes does a human male have?

A human male has one X and one Y chromosome, written as XY.

What sex chromosome is found in all human egg cells?

All human egg cells contain an X chromosome.

What sex chromosomes can human sperm cells contain?

Human sperm cells can contain either an X chromosome or a Y chromosome.

Which parent’s gamete decides the sex of the baby, and why?

The father’s sperm decides the sex, because it can carry either an X or a Y chromosome.

What sex will a baby be if an X sperm fertilises the egg?

If an X sperm fertilises the egg, the baby will be XX, so female.

What sex will a baby be if a Y sperm fertilises the egg?

If a Y sperm fertilises the egg, the baby will be XY, so male.

What is the probability of a baby being male or female in humans?

There is about a 50% chance of a baby being male and a 50% chance of being female.