Which describes a mendelian trait? A. there are many different skin color for humans.
B. human hight is controlled by Many genes.
C. humans can have a variety of shoe sizes.
D. humans can have dimples or no dimples​

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.

How does a lytic infection differ from a lysogenic infection?

What is the difference between how ionic and covalent bonds form