Biology

Colorblindness is inherited as a sex-linked recessive disease. Let’s say an
affected male marries a heterozygous female. What is the chance that they will have an affected child? Could any of their daughters be affected? Please use the letter “b” to indicate an affected chromosome.

With a Punnett square, it shows that there is a 50/50 change that a child would be affected but I got confused when the question asks about the daughter specifically. Anything helps!

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  1. "b" indicates an "x" chromosome carrying the recessive

    the father is ... xY , and the mother is ... xX

    the Punnett square gives ... xx , xY , Xx , XY ... all with equal probability

    xx - color blind female
    xY - color blind male
    Xx - female "carrier" - has gene, but not expressed - normal X dominates
    XY - normal male

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