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1. Eye color is an X-linked gene and red is dominant to white in Drosophila. If I mate a red eyed male with a white eyed female and I mate a white eyed male with a pure breeding red eyed female, the progeny from both crosses will be the same.

A. True
B. False

2. Mary met her partner Bobby at a support group for families dealing with color blindness. Mary and Bobby are unaffected but both have one brother who is affected. They have no knowledge of other family member. Which of the following is true?

A. There is a 100% probability that they will have an affected child.
B. They might both be heterozygotes.
C. Since neither one of them is affected, they are not at risk of having an affected child.
D. Bobby will not pass a mutant allele to either sons or daughters.

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  • Category:- Biology
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