If the two copies of a gene for each feature are the same version and provide instructions for only one type of protein, they are .

Somatic cells contain two alleles for every gene, with one allele provided by ... In some cases,

Explanation:

both parents provide the same allele of a given gene, and the ... Alleles produce phenotypes (or physical versions of a trait) that are either ... By this logic, in heterozygous offspring only the dominant phenotype will be apparent.

Natural selection can benefit a species by helping it adapt or stay alive in its environment. For example the peppered moth example is pretty famous due to darwin. There were white moths and white with black spots on them (peppered moth name) the ones that were peppered ended up living because they could camouflage into the trees more where as the ones that were white died due to sticking out to predators very easily.