The evolutionary link between sickle-cell trait and malaria resistance showed ... While malaria is the best-understood example of an infectious disease that has driven human evolution, numerous ...

human red blood cells are the most common cells lacking mitochondria. Other examples include tissues of the eyes, such as the lens, which is almost totally devoid of mitochondria; and the outer ...

Cells are the smallest units of life. But even within the same tissue or organ, they are not all identical. New variations arise continuously during cell proliferation. While genetic mutations alter ...

As global temperatures rise, many species are scrambling to adapt—or risk extinction. Scientists refer to these animals as ...

Finally, the chances that their child will have two copies of the gene, and therefore sickle cell anemia, is also 25 percent. This situation is a stark example of genetic compromise, or an ...