In the answer for inheritance of X-linked. genes, Madhav had shown car

1.	In the answer for inheritance of X-linked. genes, Madhav had shown carrier male. His answer was marked incorrect. Madhav was wondering why his marks were cut. Explain the reason.
Answer» Males can never be carriers. They have single X and other Y chromosome. In X linked inheritance, the genes are present on the nonhomologous region of X chromosome. Males do not have other X and hence if the genes are present on his X chromosome, they will not be suppressed in them. The Y chromosome does not have dominant gene to hide this expression as there is no homolorous region too. But in case of females, there are double X chromosomes and hence if X-linked gene is recessive, the other X can hide the expression of such X-linked gene. Thus she becomes a carrier without showing any physical characters. She is physically normal and does not suffer from such Xlinked recessive disorder. Thus, Madhav will get his answer wrong due to incorrect concept.

In the answer for inheritance of X-linked. genes, Madhav had shown carrier male. His answer was marked incorrect. Madhav was wondering why his marks were cut. Explain the reason.

Answer»

Males can never be carriers. They have single X and other Y chromosome. In X linked inheritance, the genes are present on the nonhomologous region of X chromosome. Males do not have other X and hence if the genes are present on his X chromosome, they will not be suppressed in them. The Y chromosome does not have dominant gene to hide this expression as there is no homolorous region too. But in case of females, there are double X chromosomes and hence if X-linked gene is recessive, the other X can hide the expression of such X-linked gene.

Thus she becomes a carrier without showing any physical characters. She is physically normal and does not suffer from such Xlinked recessive disorder. Thus, Madhav will get his answer wrong due to incorrect concept.

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