Biology - Probability of developing the disease

What could be the possible answer to this question? I got 1/2 but it isn’t even in the options.Where have i gone wrong?

is the answer b. 1/4 ?

hey, yes it is the answer.How did you get it?


P(one child has Huntington’s) = 1/2
P(TWO children have Huntington’s) = 1/2 * 1/2 = 1/4

Hope this helps!

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sorry I was away from my computer and didn’t see your reply, I just wanted to make sure I got the answer right before explaining it. But Juliette beat me to it ahaha

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