In humans, the condition red-green color blindness is a sex-linked recessive trait. In a family pedigree analysis, you find that two people with normal color vision have a color-blind son. This is possible if the genotypes of the parents are:
1. | XcXc and XcY | 2. | XcXc and XCY |
3. | XCXC and XcY | 4. | XCXc and XCY |
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