Can anyone help me with this ????? A woman with tritanopia (a rare form of inher

Question

Can anyone help me with this ?????

A woman with tritanopia (a rare form of inherited blue-yellow color blindness) marries a man who also has tritanopia. Their first daughter has normal colour vision but is diagnosed with PKU

(a) Based on this information, what is the most likely mode of inheritance of tritanopia?

(b) Using symbols of your own invention, write the genotypes of the two parents and of their daughter (Assume independent assortment.)

(c) What is the probability that the couple's next child is a son with tritanopia and PKU? (Assume independent assortment.)

Explanation / Answer

a- This type of color blindness is usually a sex-linked condition. The genes that produce photopigments are carried on the X chromosome.color blindness will be expressed in males with a higher probability than in females because males only have one X chromosome.in females, a functional gene on only one of the two X chromosomes is sufficient to yield the needed photopigments

b- XX: mother with tritanopia, XY: father with tritanopia; Daughter F1::XX with tritanopia 50% probablity

c: son F1: XY:with tritanopia 1000% probablity

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