Answer to Question #321106 in Genetics for Money

Question

The presence of freckles (F) is dominant to no freckles (f). Jake and his mom have freckles, but his sister and Dad do not have freckles. Complete the Punnett square that shows Jake's family.

Answer 1

Let's use the cross to consider the genotypes of all family members:

P: Ff (♀, freckles) + ff (♂, no freckles)

↓

F1:

Accordingly, one of the two upper cells of the Punnett square will display the Jake's genotype, and one of the two lower cells of the Punnett square will display the Jake's sister's genotype.