As viewed from a human perspective, nature has done some ingenious engineering to overcome some of the obstacles it has faced. Take the evolution of sex, for instance. To make the move from ...

In females, meiosis is initiated during fetal development. Digital micrographs of fetal ovary at embryonic day 14.5 hybridized to the antisense Spo11 probe are shown here in panels a and b. — Dark ...

Welcome to Mitosis vs. Meiosis. This half of the screen illustrates mitosis—the division of a cell's nucleus. Along with cytokinesis (the division of the rest of a cell), mitosis results in a ...