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This anticipation only heightens as mom's baby bump continues to grow.

Family members and friends congratulate the couple and often ask, 'Is it a boy or a girl?

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You can test out of the first two years of college and save thousands off your degree.Anyone can earn credit-by-exam regardless of age or education level.In normal situations, each person has two sex chromosomes.One chromosome is passed down from mom and the other from dad. So, in humans, sex determination is determined by dad.When a pregnancy occurs, the baby always inherits an X from mom, but it is up to dad whether the second chromosome will be another X or a Y. X-inactivation, or lyonization, occurs when one X chromosome (either from mom or from dad) is randomly inactivated in an early embryonic cell.

The process of X-inactivation leaves one X chromosome inactive in order to create equilibrium between males and females in the expression of X-linked genes.In these cells, both X chromosomes become active again.Each of these cells then independently and randomly inactivates one copy of the X chromosome.After reviewing this lesson, you should have the ability to: Did you know…We have over 95 college courses that prepare you to earn credit by exam that is accepted by over 2,000 colleges and universities.Normally, each person has two sex chromosomes; one is passed down from mom and the other from dad.