dispermy


Also found in: Medical.

dispermy

[′dī‚spər·mē]
(physiology)
Entrance of two spermatozoa into an ovum.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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CHMs are purely androgenetic conceptions (only paternal genetic material is present) and usually diploid (2 paternal chromosome complements without a maternal chromosome complement) (16); most result from fertilization of an ovum devoid of maternal genetic material by a single sperm that duplicates (monospermy; ~85%), (17-19) but a subset is due to fertilization by 2 sperm (dispermy).
[3] Three different mechanisms can lead to triploidy: (i) a non-disjunction event in meiosis 1 or 2 of spermatogenesis; (ii) non-disjunction in meiosis 1 or 2 of oogenesis; and (iii) dispermy. Dispermy is considered to be the most common cause of triploidy.
It has a crucial role in increasing sperm motility and fertilization in bulls with asthenozoospermia due to varicocele and in rabbits with dispermy caused by cryptorchidism [97].