HEREDITY
MUTATIONS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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An inactivated X chromosome
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An activated X chromosome
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An inactivated Y chromosome
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An active Y chromosome
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Detailed explanation-1: -“Barr body is the inactive X-chromosome in the somatic cells of mammalian females.” 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: -X-inactivation (also called Lyonization, after English geneticist Mary Lyon) is a process by which one of the copies of the X chromosome is inactivated in therian female mammals. The inactive X chromosome is silenced by being packaged into a transcriptionally inactive structure called heterochromatin.
Detailed explanation-3: -Barr Bodies are condensed, inactivated X chromosomes that are typically found exclusively in female mammals.