Question

The pedigree below shows several generations of a family in which cystic fibrosis runs. A healthy phenotype is dominant (C), and cystic fibrosis is recessive (c). Shaded individuals have cystic fibrosis. Symbols with question marks have unknown genotypes and phenotypes. Individual 5 is heterozygous. Which of the following is true for individual 12?

A. She could have the genotype Cc or cc
B. She could have the genotype Cc, CC, or cc
C. He will have cystic fibrosis since all of her siblings do
D. He will be healthy since all of her siblings have cystic fibrosis

I'm thinking it's A or B bc it's a circle so it's female. But I think the best answer would be B.

Answer 1

A

Step-by-step explanation:

Due to one parent having it and one parent not, and the same with the grandparents, she will be either heterozygous or homozygous recessive.