Sentences with phrase «usual number of chromosomes»
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.
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In order to supply the proper number of chromosomes to the offspring, each parent's reproductive cells undergo a remarkable process called meiosis, whereby cells from each parent are left with half the usual number of chromosomes.