Question

watch the animation on autosomal disorders, and then answer the question. inheritance of an autosomal recessive disorder parents (carriers) aa aa non - carrier child a children a carrier child aa aa aa aa carrier child affected child in the case of an autosomal dominant disorder, what is the probability of having an affected child if the mother is unaffected and the father is homozygous dominant? 0% 25% 50% 100%

Explanation:

Step1: Determine parental genotypes

Let the dominant allele for the autosomal - dominant disorder be \(A\) and the recessive allele be \(a\). The mother is unaffected, so her genotype is \(aa\). The father is homozygous dominant, so his genotype is \(AA\).

Step2: Perform cross - Punnett square analysis

When we cross \(AA\times aa\), all of the offspring will have the genotype \(Aa\) since the father can only pass on allele \(A\) and the mother can only pass on allele \(a\).

Step3: Calculate probability

Since an individual with genotype \(Aa\) is affected in an autosomal - dominant disorder, the probability of having an affected child is 100%.

Answer:

100%