Question

multiple choice 1 point
d= dimples
d= no dimples

two brothers both have dimples.
one has a genetic makeup of dd and the other one is dd.

which of the following statements is true?
○ they have the same phenotype and genotype.
○ they have different phenotypes and genotypes.
○ they have the same phenotype but different genotypes.
○ they have the same genotypes but different phenotypes.

Explanation:

Phenotype refers to observable traits (here, having dimples). Genotype is the genetic makeup. Since D is dominant for dimples, both DD and Dd genotypes result in the dimpled phenotype, so their phenotypes are identical but genotypes differ.

Answer:

They have the same phenotype but different genotypes.