Sentences with phrase «called polar bodies»

Each egg randomly discarded all but one of the copies by pushing the extras out in two blobs, called polar bodies.

Normally, a smaller cell called a polar body pinches off from the egg.

Not exact matches

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.

A. angustidens called South America home about a million years ago and weighed an estimated 1,500 pounds — that's almost twice the body mass of the average polar bear.

Another staining technique called comparative genome hybridisation (CGH), which labels all chromosomes, has previously been used to analyse abnormalities in the polar body — a chromosome - containing sac expelled from the egg shortly after fertilisation.

To create an egg, a progenitor cell called an oocyte divides into two daughter cells: a hulking egg cell and a wimpy polar body.

The researchers believe the hammerhead shark reproduced by a type of asexual reproduction called automictic parthenogenesis, whereby an unfertilised egg is activated to behave as a normal fertilised egg by a small, nearly genetically identical cell known as the sister polar body.