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Sexual reproduction involving union of gametes.



in animals, plants, and humans, the union of male and female sexual cells; a synonym of fertilization.

References in periodicals archive ?
at 212 ("[T]he Catholic Church and the President's Council on Bioethics appear to have concluded that syngamy constitutes the point at which conception has occurred.
Gynogenesis in Phoxinus hybrids is not 100% efficient, however, and syngamy of the sperm and ova pronuclei occasionally does take place.
This is unlike sexually reproducing species of fish (reviews by Reznick and Miles 1989; Travis 1989; Trexler 1989) or the clonal Poeceliopsis (reproduces via genome exclusion) in which syngamy occurs (Miller and Schultz 1959; Weeks and Gaggioti 1993).
The sexual organization of mammalian bodies occurs in a well-defined sequence of developmental events beginning at syngamy and ending at puberty; that is, chromosomal sex determines gonadal sex, which directs sexual differentiation of the genital ducts, external genitalia, and secondary sex traits.
The human centrosome is responsible for normal syngamy and early embryonic development.
In fact, however, there is a period of some twenty hours after the sperm penetrates the egg before the genetic material of egg and sperm begin to merge--a process known as syngamy.
This means that they are capable of interacting in a way that results in syngamy.
However, strictly speaking, homonomy at the chromosomal level is an homology at the level of syngamy, as paralogy is homology at the level of duplication of the ancestral gene (or sequence) (Nelson, 1994).
One mechanism involves the failure of the parasite to exflagellate or to undergo syngamy in the midgut of mosquitoes, probably because mosquitoes lack an exflagellation stimulator (Nijhout 1979).
Two stains were used in this study to visualize the nuclei within ovarian, coelomic, and spawned oocytes in order to (1) determine the stage and location of oocytes at sperm-egg fusion and (2) describe nuclear events during egg maturation, pronuclear migration, and syngamy.