Question

sean and michelle are healthy, but their daugher molly was recently diagnosed with cystic fibrosis. Guess the genotype of the parents for cystic fibrosis disease?

a. sean and michele are heterozygous for cystic fibrosis allele, they are carreirs

b. sean and michele are homozygous for cystic fibrosis allele, but the disease will be manifested later in their life

c. sean does not have the cystic fibrosis allele, he is homozygous for the healthy variant of the gene, michell is the carrier, heterozygous for the cystic fibrosis allele.

D. need more information

im confuse with the question i was not sure if i had to set up the pundett squre for xy and xx for male and female can you expalin ?  

Answer 1

Option A both are heterozygous for the allele

And are carrlier