a small, densely (something) structure in the cell nucliei of female mammals, consisting of a condensed inactive x chromosome. It is regarded as diagnostic of genetic remoteness. read more
Roughly 50%. The egg has an X chromosome. The sperm contributes either an X or a Y. If there are two Xs, then the baby will be female. If XY then the baby will be male. Since about half of all babies are female (slightly more than half), I'd say about half of all sperm carry the X chromosome. read more
My Biology Chapter 14 Guide Learn with flashcards, games, and more — for free. read more