Genes for color blindness (inability to distinguish between red and green colors) and normal vision are linked to the X chromosome. What will be the offspring from the marriage of a Daltonian woman with a healthy man?
If the gene for color blindness is recessive, then girls born from a marriage of a healthy man and a woman who is color blind will have normal vision, because they will inherit the gene for normal vision with the X chromosome of their father. Boys, however, will be color blind, because they will receive a gene for color blindness from the mother’s X chromosome.
If this gene was dominant, then all children would be color blind, regardless of gender, if the mother was homozygous for this gene. If the gene for color blindness was dominant, and the mother was heterozygous for it (this is not known by condition), then half of the children, regardless of gender, would have problems distinguishing between red and green in distinguishing colors.
Based on the fact that color-blindness disorders in men are more common than in women, it can be concluded that the color-blindness gene is recessive and the color-blind woman is homozygous for it.
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