Freckles are a dominant trait in humans. Both of the girls have the genotype FF for freckles. If either one marries a man with no freckles, what are the chances that their children will have freckles?

Question

Responses
A 0%0%
B 50%50%
C 75%75%
D 100%100%

Answer 1

Since both girls have the genotype FF for freckles, they both have two dominant alleles for the freckle trait. If either one marries a man with no freckles, who would have the genotype ff (since he has no freckles), the potential offspring's genotypes would be:

• Mother: FF
• Father: ff

When we set up a Punnett square, we can see the possible genotypes of their children:

      F   |   F
--------------
f |  Ff  |  Ff
--------------
f |  Ff  |  Ff

All offspring will have the genotype Ff, which indicates they will all express the dominant trait of having freckles.

Therefore, the chances that their children will have freckles are 100%.

So the correct response is: D 100%