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A woman comes to you a genetic counselor and indicates that might be color blind., she...

A woman comes to you a genetic counselor and indicates that might be color blind., she just doesn’t know. Something about this makes you suspicious, especially since you know that colorblindness is X-linked and thus very rare in women-what is the one question you want to ask her family.

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Answer #1

As a genetic counsellor, I must ask her family:

Whether the parents (particularly father) of that woman is colorblind or not?

A colorblind man means he has a defective X chromosome which pairs with a Y. His daughter will inherit this defective X and another X from her mother. We have now to possibilities:

A) The mothers X is also defective concerning color vision.

B) The daughter inherited an X encoding perfect color vision.

In the first case, the daughter definitely shows some form of color blindness which she inherited from both of her parents. If one X is affected then this woman has about 50% of defective genes in her eye.

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