Sentences with phrase «number of fertilized eggs»

This doesn't achieve much in terms of controlling toad populations, because a single male can fertilize the clutches of many females — so the few lucky males that are left behind may have a pretty exciting life, and the number of fertilized eggs laid in that pond isn't reduced at all.

Not exact matches

And for an interesting look at the problem of categorizing the pill as an abortifacient, check out Libby Anne's piece on the topic, where she notes that «if your goal is to save «unborn babies,» and if you truly believe that a zygote — a fertilized egg — has the same value and worth as you or I — the only responsible thing to do is to put every sexually active woman on the pill,» because the pill actually reduces the number of zygotes naturally rejected by a woman's body.

They made these clones by a process called automatic parthenogenesis: The egg is formed normally (with half the species» usual number of chromosomes), then fertilized by the «polar body,» a cell that is created during oogenesis and contains the same gene copies as the egg, resulting in the shark having half the genetic variation of its mother.

And story number 4: Researchers have found a pair of semi-identical twins that came about when two sperm fertilized a single egg, which then split in two to give rise to two individuals.

Animal breeders have sometimes seen such large sperm from livestock, but those turned out to have twice the number of chromosomes they were supposed to and were likely unable to fertilize eggs.

Although the statistics on the failure rate of human fertilization are not entirely robust, given the biological and ethical delicacy of conducting research in this area, the numbers consistently suggest that, at minimum, two - thirds of all human eggs fertilized during normal conception either fail to implant at the end of the first week or later spontaneously abort.

This legislation is notable because the Swiss Constitution broadly prohibits research using human embryos and even sets controls over the number of eggs that may be fertilized and developed outside a woman's body during fertility treatments.

All women are born with a limited number of eggs to be fertilized in order to make another life.