객관식
How many Barr bodies would you expect to find in a cell from a person with the genotype XXY?
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13. Mendelian Genetics
X-Inactivation
객관식
A Barr body is:
A
An inactive Y chromosome.
B
An active X chromosome.
C
An inactive X chromosome.
D
An active Y chromosome.
검증된 단계별 안내1
Understand that a Barr body is related to the X chromosome in females. In humans, females have two X chromosomes, while males have one X and one Y chromosome.
Recognize that in females, one of the X chromosomes becomes inactive to balance the dosage of X-linked genes between males and females. This process is known as X-inactivation.
The inactive X chromosome condenses into a structure known as a Barr body. This is a normal process in female cells to ensure that only one X chromosome is active.
Remember that the Barr body is not an active chromosome; it is the inactivated X chromosome. This is a key point in understanding the concept of dosage compensation in genetics.
Therefore, the correct description of a Barr body is 'an inactive X chromosome.' This helps maintain genetic balance between males and females.
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