In flies, red eyes (R) are dominant to brown eyes (r) and brown bodies (B) are dominant to yellow bodies (b). A fly with genotype R r B b is mated with a fly with genotype r r b b. What percentage of offspring will have red eyes and yellow bodies?

The gene that causes sickle-cell disease is present in a higher percentage of residents of sub-saharan africa than among those of african descent living in the united states. even though this gene causes sickle-cell disease, it also provides some protection from malaria, a serious disease that is widespread in sub-saharan africa but absent in the united states. discuss an evolutionary process that could account for the different percentages of the sickle-cell gene among residents of the two regions.

Many animals cannot sweat to maintain a stable body temperature. what is one other way animals can cool down?

Apart of an ecosystem that can restrict the growth of a population is referred to as