What is the only thing found inside a virus

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.

The picture shows a fishing technique called trawling. how might trawling affect marine biodiversity

To determine if a particular plant is homozygous or heterozygous, you would have to test cross with a