In the beginning of this II part module, we used an example of a couple, both ph

Question

In the beginning of this II part module, we used an example of a couple, both phenotypically normal, with two children: one unaffected daughter and one son affected with a genetic disorder. The phenotype ratio is 1:1, making it difficult to determine whether the trait is autos ornal or X linked with your knowledge of genetics, what are the genotypes of the parents and children in the autoso aleasein the X-linked case? What is the chance that a color blind male and a carrier female will produce (Color blind is a X-linked trait) a) a color blind sent b) a color blind daughter?

Explanation / Answer

1) A daughter recieves one X chromosome from mother and other X chromosome from father and son receives X chromosome from mother and Y chromosome from father. So keeping this in mind, if daughter is normal but son is affected that means mother is the carrier and father is normal.

2) Male XcY and female XCXc

daughers - XCXc (carrier) and Xc Xc (color blind female) sons - Xc Y (color blind) and XCY (normal)

Half sons or 50% sons will be color blind and Half daughters will be carrier and other half or 50% daughters will be color blind.

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