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]
Words and phrases related to 'Zygote'
Zygote Sample Sentences in News
- Letter: A blueprint is not a house; a zygote does not have the same moral status as a baby
EDITOR: In a recent letter to the editor, D.J. Freeman expressed the view that human life does not begin with embryological development. In support of this position, consider this argument: Whatever else we are, human beings are living human bodies. Read more on this news related to 'Zygote'
- Letter: Of course a zygote is a human being
EDITOR: I am writing in response to Dr. D.J. Freeman's letter, which appeared in the opinion page on Feb. 13. Freeman stated that a fertilized human ovum is not human, but merely a 'possible human being,' one that may not develop into a Read more on this news related to 'Zygote'
- Research reveals the mechanisms that guide the fate of individual embryonic cells
The fusion of a sperm and egg yields a zygote with an unconstrained capacity to develop into any cell type in the body. Subsequent rounds of cell division limit those options as the embryo enters a developmental program that establishes the formation of tissues, organs and limbs. Read more on this news related to 'Zygote'