Lesson: Chapter 20 — Heredity

20.5. Sex determination 2 of 6 Reset answers

Clear all your answers?

This erases every answer in this set and starts you again at question one. Your score will be gone.

Type these four numbers to confirm:

Those numbers don't match. Look at them again and type them.

Yes, clear Keep them

Question 2

What are the sex chromosomes of a human female?

A X only B XX C YY D XY

The right answer is the one marked above.

XX. A female has two X chromosomes — a matching pair, like all the autosomes. A male has one X and one Y.

The male pair is the only one in the body that does not match, and everything in the next skill follows from that.

Answer the question to continue.