An executive order President Trump signed on his first day back in office offers a new federal government definition of the ...

As part of President Donald Trump‘s handfuls of executive orders signed within the first couple of days of his second ...

(d) “Female” means a person belonging, at conception, to the sex that produces the large reproductive cell. (e) “Male” means a person belonging, at conception, to the sex that produces the small ...

New research from the University of Sheffield reveals how marijuana use affects sperm quality and shape, potentially ...

New research is offering deeper insights into the role of the active X chromosome and its effects on brain health.

Trump’s order says it is intended to protect women’s spaces from those who “self-identify” as women. It defines the sexes in an unconventional way, based on the reproductive cells — large cells in ...

Primordial germ cells, the founder cells of the germ line, are set aside in the early animal embryo, and divide and differentiate to produce sperm and egg, the male and female gametes ...

Thus, the ginkgo lays "eggs" quite analogous to those of a hen ... The presence of water and swimming sperm is characteristic of aquatic fertilization or zooidogamy (from "zooid," swimming cell, and ...

The fusion of an egg and a sperm triggers a complex plethora ... This Research Topic, “Fertilization and early embryogenesis: from Research to clinical practice,” is comprised of thirteen publications ...

For any animal, releasing sperm cells requires a bit of time ... Most fish species mate using external fertilization. The female will deposit eggs outside of the body, usually near the bottom ...