AP BIOLOGY

Detailed explanation-1: -Answer: There is 50% chances of children will be male and 50% chances of male child will be colour-blind. Explanation: Genes are inherited from biological parents.

Detailed explanation-2: -Data shows that X-linked recessive trait of color-blindness is present in 5% of males overall in the population. However, if a mother who is a carrier and father who is unaffected plan to have 3 children, what is the probability the children will be 2 normal females and 1 color blind male?

Detailed explanation-3: -The X chromosome in human follows criss-cross inheritance wherein father transmits its only X chromosome to the daughters while mother passes both X chromosomes to her sons. Thus, the X-linked genes, present on X-chromosomes, cannot be transmitted from father to son.

Detailed explanation-4: -What is X-linked inheritance? There is a 50 percent chance that daughters carry the gene and can pass it to the next generation. There is a 50 percent chance that a daughter will not carry the gene and, therefore, cannot pass it on. There is a 50 percent chance that sons do not have the gene and will be healthy.

Detailed explanation-5: -Each daughter has a 50% chance of being a carrier and each son has a 50% chance of being color blind. The daughters who are carriers can have color blind sons with the same logic.