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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. This difference would disturb metabolic balance in one sex or the other.

X-inactivation can also occur in males with Klinefelter syndrome who have more than one X chromosome.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?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.

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