THE MOLECULAR BASIS OF INHERITANCE
THE HUMAN GENOME
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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one of the Y chromosomes in a male cell
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one of the X chromosomes in a male cell
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one of the X chromosomes in a female cell
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both of the X chromosomes in a female cell
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Detailed explanation-1: -Females have two X chromosomes. Since the somatic cells of females are not involved in sexual reproduction. Here one of the two X chromosomes is inactivated by lyonization. This inactive X chromosome is known as a Barr body.
Detailed explanation-2: -The Barr body, also sometimes called the sex chromatin, is the inactive X chromosome in female somatic cells. Human females have two X chromosomes, while males have one X and one Y.
Detailed explanation-3: -Someone with two X chromosomes (such as most human females) has only one Barr body per somatic cell, while someone with one X chromosome (such as most human males) has none.
Detailed explanation-4: -Barr Bodies are condensed, inactivated X chromosomes that are typically found exclusively in female mammals.
Detailed explanation-5: -In X-inactivation, an X chromosome is compacted (or, as my intro bio professor liked to say, “crumpled up into a ball"), to make a small, dense structure called a Barr body. Most of the genes on the Barr body are inactive, meaning that they are not transcribed.