How do i find the mothers genotype if i know the genotype of the fater and only the two sons instead of three

How are gene and protein sequences used to classify organisms?

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.

Which process of living things produces water that enters the water cycle