Sex Determination in Humans Flashcards

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In humans, what are the two types of sex chromosome called?

They are called the X chromosome and the Y chromosome.

What pair of sex chromosomes does a typical human female have?

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

What pair of sex chromosomes does a typical human male have?

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

Which parent’s gamete decides the sex of a human baby?

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

What sex chromosome does every human egg cell carry?

Every egg cell carries one X chromosome.

What sex chromosomes can human sperm cells carry?

A sperm cell can carry either an X chromosome or a Y chromosome.

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

The baby will be female, with XX sex chromosomes.

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

The baby will be male, with XY sex chromosomes.

In humans, what is the chance of a baby being male or female each time?

There is about a 50% chance of a boy and a 50% chance of a girl.