Answer :
Answer:
According to Mendelian genetics, if a couple has two sons, one with color blindness and one with normal vision, and they have two daughters, the probability of both daughters having normal vision is 100%. This is because color blindness is a recessive trait, meaning that a person must inherit two copies of the recessive allele (one from each parent) to express the condition. If one parent is color blind and the other has normal vision, they must have different alleles for the color blindness gene. Therefore, their daughters would inherit one normal allele from each parent, resulting in normal vision.
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Answer:
50%
Explanation:
As the couple is with normal vision, the mother is carrier for the gene. Therefore, both their daughters will have normal vision but with a possibility of 50% being carrier for colour blindness.