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?

Freckle is the inherited disease in which brown spots are generated on the skin. As Freckles are a dominant trait in humans so even a single allele of freckle if present in the gene can cause the disease.

So according to the question, both the girls are homozygous dominant because the allele type is FF. As the girl homozygous for freckle disease marries a man with no freckles then the chances that their children will have freckles is 100% because one dominant allele of freckle will be transferred by mother in the offspring which is sufficient to cause the disease.

The genotype of all offspring for freckle will be Ff which shows that children are heterozygous for the disease. Therefore all the offspring will have freckles so the chances are 100%.

9.9 years

a = p(1 + rt) . . account balance after time t at rate r starting with principal p

3000 = 2500(1 + 0.0202t) . . filling in the given numbers

1.2 = 1 + 0.0202t . . divide by 2500

0.2 = 0.0202t . . . subtract 1

0.2/0.0202 = t ≈ 9.901

it will take about 9.9 years for the account balance to reach $3000.

the answers are a and c