13.2

Question 1

Summarise X inactivation

Answer 1

• One of two x chromosomes expressses Xist RNA in its X inactivation centre
• When Xist RNA gene is transcribed, RNA is produced that coats the entire chromosome, and induces heterochromatization of the entire chromsome

Question 2

What is genetics

Answer 2

• Study of heredity
• That is, the study of how genetic traits are passed on to offspring