Question

the punnett square shows a cross between two parents. the allele (h) represents the mutated gene that causes huntington’s disease while the allele (h) represents an unaffected state. one parent is affected by huntington’s disease while the other parent is unaffected by the disease. what can be concluded about the nature of huntington’s disease? the disease is sex - linked recessive. the disease is sex - linked dominant. the disease is autosomal recessive. the disease is autosomal dominant.

Explanation:

The Punnett - square shows that when one parent is Hh (affected) and the other is hh (unaffected), the offspring with Hh are affected and hh are unaffected. Since having just one copy of the mutated allele (H) results in the disease, it means the disease is dominant. Also, there is no indication that the inheritance is related to sex - chromosomes, so it is autosomal.

Answer:

The disease is autosomal dominant.