Refer to the Figure Showing a Family Pedigree in Which

Multiple Choice

Refer to the figure showing a family pedigree in which several individuals develop a neurodegenerative disease late in life. If individual A (in generation III) has children with an unaffected woman, what is the probability that their first child will be affected?

A) 0 percent
B) 25 percent
C) 33 percent
D) 50 percent
E) 100 percent