Colour-blindness is an X-linked trait. Stacy and Justin, neither of whom are colour-blind, are expecting dizygotic (non-identical) twin boys. Stacy's father is colour-blind. what is the probability that BOTH sons will be colour-blind?
a. 1/4
b. 1/16
c. 1/2
d. 1/8
e. 1
Answers: 3
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Colour-blindness is an X-linked trait. Stacy and Justin, neither of whom are colour-blind, are expec...
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