Question 13 (5 points) Too much exposure to ultraviolet (UV) radiatioin from the sun can cause which of the
following conditions in the integumentary system?

Allergic reactions

Vitamin D deficiency

Acne

Skin cancers

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.

Can a trait be both polygenic and have multiple alleles? explain why or why not.

Agene editing technology called crispr-cas9 uses cellular machinery to change the cell's genetic material. how might this technology be useful in treating diseases like cancer?