Dictionary Meaning and Definition on 'Zygote'
n : the cell resulting from the union of an ovum and a
spermatozoon (including the organism that develops from
that cell) [syn: fertilized ovum]
Wikipedia Meaning and Definition on 'Zygote'
A zygote (from Greek ζυγωτός zygōtos "joined" or "yoked", from ζυγοῦν zygoun "to join" or "to yoke"),
In mammalian reproduction, after fertilization has taken place the zygote travels down the fallopian tube, while dividing to form more cells
Twins and other multiple births can be monozygotic (identical) or dizygotic (fraternal). Dizygotic twins arise from one or several—strictly, two—fertilization events. Polyspermic zygotes in mice have been manipulated so as to remove one of the two male pronuclei and made to survive birth.
Conjoined twins, sometimes called "Siamese twins", occur once in every two hundred identical twin pregnancies and are always identical. Actual numbers for conjoined births vary from 1 in 20,000 to 1 in 100,000 pregnancies; 40–60% are stillborn, with many others dying within the first few days after birth. About 70% of conjoined twins are female, the reason for which is unknown.[See more about Zygote at Dictionary 3.0 Encyclopedia]