What came first, the chicken or the egg? If we’re talking about eggs in general, then the latter, but a new study of an ...

An egg becomes fertilized when a sperm penetrates it, creating a zygote. For the first eight weeks, the developing baby is called an embryo. It looks like a tadpole. At about three weeks ...

Chromosphaera Perkins, or C. Perkins, is an ancestral species of protist. Diverging from the animal evolutionary line over a ...

The study, which McGrath conducted with Yale colleagues, explored a phenomenon of genetics that intrigued him. When a sperm cell fertilizes an egg, the resulting zygote has the genetic information ...