Question

Photopigment genes are located on the X chromosome. Color blindness occurs when an individual has missing or damaged alleles. A woman who carries a damaged photopigment allele but has normal vision marries a man with normal vision. What is the probability that their son will be color blind

Answer 1

The probability that their son exhibits the 'color blind' trait is 0%. It is a type of inheritance linked to the X chromosome.

Inheritance linked to the X chromosome

In men, the patterns of inheritance linked to the X chromosome don't follow conventional mendelian inheritance because men have only one X chromosome.

Conversely, women have two X chromosomes, thereby the inheritance pattern resembles Mendelian inheritance.

It is important to highlight that color blindness is a recessive trait on the X chromosome.

In this case, the mother is a carrier, thereby the probability of passing this trait as a carrier to her son is 50%, whereas the father is normal, thereby the probability of passing this trait to his son is 0%.

Learn more about inheritance linked to the X chromosome here:

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