A certain sex-linked gene, symbolized by the letter t, is recessive, and causes

Question

A certain sex-linked gene, symbolized by the letter t, is recessive, and causes you to be a tuna lover, with terrible cravings for tuna swirl ice cream. If you have the dominant gene T, you are normal and hate tuna swirl ice cream. So, for example, the genotype of a tuna-loving female would be XtXt. But you can type it this way: XtXt (don't use any spaces). A tuna-loving male mates with a normal female whose father was a tuna lover. What is the probability that they will have a tuna-loving son?

Please show the punnet squares used to get the answer

Explanation / Answer

The genotype of a tuna-loving male is XtY and the genotype of a normal female whose father was a tuna lover is XtX (because she inherits one X from her father). Cross between these two will have the children with the following genotypes.

XtY* XtX = XtXt, XtX, YXt (tuna loving son), XY

Thus, the probability of having a tuna-loving son = 1/4

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