Account for the hereditary influence on the phenotype in a cumulative way.

Additive alleles

Explanation:

Additive alleles account for the hereditary influence on the phenotype in a cumulative way.

Alleles are nothing but variations of a gene. that simply gives variation to the traits.

Whereas, Additive alleles are alleles that contribute to most observable traits, such as height, weight, hair color, eye color,and complexion. Therefore, they account for the hereditary influence on the phenotype.

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 correct answer is d