Rey, who has a normal vision (XY),married Cindy who has a normal vision but carries a gene for
color-blindness (XX) What is the chance to
have a colorblind baby girl?

There is no chance that Rey —who has a normal vision man— and Cindy, who is a woman colorblind carrier, will have a colorblind daughter.

Explanation:

If a man with normal vision and women who is a carrier of colorblindness has a daughter there is a 50/50 chance of having a colorblindness carrier daughter. And all daughters would have normal vision.

Color blindness is a visual condition characterized by the inability to discern some colors, and has a recessive inheritance pattern linked to the X sex chromosome. This means that all males with the defective gene (Xd) would be color blind, while a female to be color blind must have both X chromosomes affected.

In the case of Rey and Cindy

♂ XY

♀XdX

Alleles     X      Y

Xd          XdX  XdY

X            XX     XY

Of the daughters they have, half could be carriers, while the other half would not have the altered gene. In any case, none of their daughters could be colorblind.

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