Sickle cell disease in an inherited blood disorder. it is a recessive trait. that means you can carry one recessive allele for the disease and not have the symptom. in this case, if you were a carrier and did not have the disease, your genotype for sickle would be

The answer is

Aa

It could be any letter as long as its one capital letter firsts and one small letter after

•there must be variation for the particular trait within a population.

•the variation must be inheritable (that is, it must be capable of being passed on from the parents to their offspring).

•individuals with one version of the trait must produce more offspring than those with a different version of the trait.good

explanation:

it would be heredity