All living things have certain characteristics. how many characteristics are used to describe living things?

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 probability of producing a normal child by two parents who are carriers for an autosomal recessive disorder is

How does the color of light affect the germination time (amount time a plant takes to develop) of a radish seed?