You are a genetic clinician and are approached by Kate and William for genetic investigations. In discussions with Kate and William, you construct the family tree below where affected individuals have Mendelian inherited deafness.
Assuming there are no de novo mutations in the pedigree shown, what is the probability (likelihood) that Kate's mother, Dianne, is a carrier (choose the most correct answer)?
Question 3 options:
0%
25%
33%
50%
66%
75%
100%