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by Toban Black

Question by Miyhkala:

Why are sex-linked genes expressed differently in different cells of a female body?

A.Different cells inherit different genes.
B.One of the two X chromosomes is inactivated at random in each cell.
C.Males do not have a functioning X chromosome after they are inactivated.
D.Sex-linked genes are expressed differently in males than in females.
can someone give me the answer and explain it?

Best answer:

Answer by Derek
B. One of the two X chromosomes is inactivated at random in each cell

The reason why is kind of hard to explain:

Basically, since cells in male organisms only have one X chromosome, each X chromosome must be able to produce an adequate amount of products (proteins, pigment, etc) for a cell to function properly. Since females have two X chromosomes, they would normally produce twice as much as is necessary. In some cases, this overproduction can be harmful. Thus, one of the X chromosomes will "shut down" and turn into what is call a Barr Body.

With one of the chromosomes turned off, the remaining X chromosome will express its trait within that cell, regardless of dominance. Since the decision of which chromosome turns into a Barr Body is random, the female will have different cells expressing different genes.

Sorry this was very wordy! Hope it helps though!

Know better? Leave your own answer in the comments!