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Free 5-day trial Pregnancy is such an exciting time for many couples.They anxiously await the arrival of their precious bundle of joy.If the X-linked genes were expressed equally in both sexes, females would produce approximately twice the level of X-linked gene products as would males and cause a metabolic imbalance between the two sexes.The number of Barr bodies is always one less than the total number of X chromosomes.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.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.

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

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 is the process of bringing equivalence in the expression of X-linked genes in females and males.

Normally, each person has two sex chromosomes; one is passed down from mom and the other from dad.

A woman has two X chromosomes and a male has an X and a Y chromosome. So, in humans, sex determination is determined by dad. Females receive two X chromosomes, whereas males receive only one chromosome. If the X-linked genes were expressed equally in both sexes, females would produce approximately twice the level of X-linked gene products as would males.

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Sex determination in humans occurs at the time of conception.

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