Julie has Harman's ataxia (hh)and also has achrondoplasia (Aa).Josh is a carrier for Harman's ataxia,an autosomal recessive disorder,and has achondroplasia (Aa),which is an autosomal dominant trait.AA human embryos do not survive beyond the first few cell divisions.What is the probability that a child born to them would have only Harman's ataxia? Assume the genes are unlinked.

Question

Quizplus · Accepted Answer

The probability of the child having only Harman's ataxia (hh) is 1/2 (from Josh being a carrier) multiplied by the probability of not having achondroplasia (aa), which is 1/3 (since AA embryos do not survive, leaving Aa and aa as possibilities). Thus, the probability is 1/2 * 1/3 = 1/6.

Julie Has Harman's Ataxia (Hh)and Also Has Achrondoplasia (Aa)