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Biology 20 Online
OpenStudy (anonymous):

Red-green color blindness is a sex-linked recessive trait in humans. If two people with normal vision have a color-blind son, what is a possible genotype combination of the parents? A. XCXC and XCY B. XCXc and XCY C. XcXc and XcY D. XCXC and XcY

OpenStudy (anonymous):

I'm thinking C, but i'm not sure...

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