Digyny

Digyny (also digynia) refers to the process of a diploid ovum becoming fertilized by a haploid sperm. The result of digyny is a triploid zygote. In humans, both gametes (ovum and sperm) are normally haploid and give rise to a diploid zygote.¹

Digyny results in gestational abnormalities in humans, including an abnormally small placenta and a very growth-restricted fetus.² As a result, the majority of triploid pregnancies are spontaneously aborted.² The incidence rate of a live-born triploid human is approximately 1 in 100,000.³

References

Thomas Lathrop Stedman (2001). Stedman's Medical Speller. Lippincott Williams & Wilkins. ISBN 978-0-7817-3085-3.
McFadden, D. E.; Robinson, W. P. (2006). "Phenotype of triploid embryos". Journal of Medical Genetics. 43 (7): 609–612. doi:10.1136/jmg.2005.037747. ISSN 1468-6244. PMC 2564556. PMID 16236813.
Chen, Harold (2017), "Triploidy", Atlas of Genetic Diagnosis and Counseling, Springer, New York, NY, pp. 2807–2820, doi:10.1007/978-1-4939-2401-1_232, ISBN 978-1-4939-2401-1, retrieved 2026-05-19{{citation}}: CS1 maint: work parameter with ISBN (link)

[Stedman2001-1] Thomas Lathrop Stedman (2001). Stedman's Medical Speller. Lippincott Williams & Wilkins. ISBN 978-0-7817-3085-3.

[:0-2] McFadden, D. E.; Robinson, W. P. (2006). "Phenotype of triploid embryos". Journal of Medical Genetics. 43 (7): 609–612. doi:10.1136/jmg.2005.037747. ISSN 1468-6244. PMC 2564556. PMID 16236813.

[3] Chen, Harold (2017), "Triploidy", Atlas of Genetic Diagnosis and Counseling, Springer, New York, NY, pp. 2807–2820, doi:10.1007/978-1-4939-2401-1_232, ISBN 978-1-4939-2401-1, retrieved 2026-05-19{{citation}}: CS1 maint: work parameter with ISBN (link)

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See also

References