Digyny

Digyny

Digyny (also digynia) refers to the process of a diploid ovum becoming fertilized by a monoploid sperm. The result of digyny is a triploid zygote. In humans, both gametes (ovum and sperm) are normally monoploid and give rise to a diploid zygote.

Digyny results in gestational abnormalities in humans, including an abnormally small placenta and a very growth-restricted fetus. As a result, the majority of triploid pregnancies are spontaneously aborted. The incidence rate of a live-born triploid human is approximately 1 in 50,000.

See also

References

  • Stedman's Medical Dictionary, 27th edition, page 501.



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Look at other dictionaries:

  • digyny — noun The fertilization of a diploid ovum by a monoploid sperm, resulting in a triploid zygote. See Also: digynous …   Wiktionary

  • digyny, digynia — Fertilization of a diploid ovum by a sperm, which results in a triploid zygote. Cf.:diandry. [di + G. gyne, woman] …   Medical dictionary

  • Polyploidy — occurs in cells and organisms when there are more than two homologous sets of chromosomes.Most organisms are normally diploid; polyploidy may occur due to abnormal cell division. It is most commonly found in plants. Haploidy may also occur as a… …   Wikipedia

  • Polyploid — This image shows haploid (single), diploid (double), triploid (triple), and tetraploid (quadruple) sets of chromosomes. Triploid and tetraploid chromosomes are examples of polyploidy. Polyploid is a term used to describe cells and organisms… …   Wikipedia

  • Di- (prefix) — Di comes straight from the Greek and means twice or double or twofold, as in diacid, diamelia (absence of two limbs), diandry (double male genetic contribution) and digyny (double female genetic contribution); the drugs diazepam, dicyclomine… …   Medical dictionary

  • diandry, diandria — The phenomenon in which a single ovum is fertilized by a diploid sperm and hence produces a triploid fetus. Cf.:digyny. [di + G. andros, male] …   Medical dictionary

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