What are the chances that Sally will have Huntington’s disease?

Question

Huntington’s disease is degenerative disease of the nervous system caused by a lethal dominant allele that has no obvious phenotypic effect until the individual is about 35 to 45 years old.

What is the genotype for Sally’s father? Explain your answer.

What are the chances that Sally’s mother was homozygous dominant for Huntington’s disease? Explain your answer.

What are the chances that Sally will have Huntington’s disease? Explain your answer.

Answer 1

We need to see a pedigree or know some other information about the family.

I expect the answer for number two to be "a very small chance" because the allele for Huntington's is pretty rare in the population and it's very unlikely that a person would get a copy of the allele from both of her parents.

Can't answer the others without more info.

Answer 2

You don't give nearly enough information? How about some phenotypes?