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6. (a) What is a Barr body? (b) How does it relate to the idea of...

6. (a) What is a Barr body? (b) How does it relate to the idea of females being genetic mosaics?

7. In humans, pointed eyebrows are dominant over smooth eyebrows. Mary’s father has pointed eyebrows, but she and her mother have smooth. What is the genotype of the father? Explain your reasoning!

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Answer #1

Q 6 (a) Barr body is the inactive X chromosome in female somatic cell. It is named after Murray Barr who discovered it.

(b)- Becuase females have two copies of X chromosome and only one can be active. Therefore some kind of adjustment is needed between these two X chromosome to carry out its function properly and this is achieved by X-chromosome inactivation. A female is a mosaic because consist of mixture of two different kind of cell each with different functional chromosomes. Because of X-chromosome inactivation females are mosaics.

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