Word: ys
(lookup in dictionary)
(lookup stats)
Dates: during 1990-1999
Sort By: most recent first
(reverse)
...carry an X chromosome and some carry a Y. If the former fertilizes an egg, the baby will be a girl; if the latter, a boy. Over the years, fertility gurus have tried to boost production of X- or Y-bearing sperm through diet, or attempted to pick out Ys by their supposedly faster swimming speed or distinct electric charge--with dubious success...
...scientist Lawrence Johnson, who invented the method, they stained sperm with a fluorescent dye that latches onto DNA. Measuring the glow of the sperm cells under laser light, they could gauge how much genetic material each one carried. As it happens, X chromosomes have about 2.8% more DNA than Ys. Once the sperm had been distinguished this way, an automated sorting machine separated the Xs from the Ys, and doctors could perform artificial insemination...
...nearly 30,000 college men and women. And below them lie the foundation of the culture, nearly a million high school players of both sexes (from 16,500 schools) who even now are contesting one another for state titles. And still there are more players in church leagues, the Ys and public playgrounds...