polyspermy

Penetration of more than one spermatozoon into an ovum at time of fertilization. Occurs as normal event in very yolky eggs (eg. bird), but then only one sperm fuses with egg nucleus. Many other eggs have mechanisms to block polyspermy.

Polyspermy

In biology, polyspermy describes an egg that has been fertilized by more than one sperm. Diploid organisms normally contain two copies of each chromosome, one from each parent. The cell resulting from polyspermy, on the other hand, contains three or more copies of each chromosome—one from the egg and one each from multiple sperm. Usually, the re...
Found on http://en.wikipedia.org/wiki/Polyspermy

polyspermy

(from the article `fertilization`) ...causes a change in the egg membrane(s), so that the attachment of and penetration by more than one spermatozoon cannot occur. In species in which ...
Found on http://www.britannica.com/eb/a-z/p/91

polyspermy

(pol″e-spur´me) fertilization of an oocyte by more than one spermatozoon; occurring normally in certain species (physiologic polyspermy) but only abnormally in species such as humans (pathologic polyspermy).
Found on http://www.encyclo.co.uk/local/21001

Polyspermy

• (n.) Fullness of sperm, or seed; the passage of more than one spermatozoon into the vitellus in the impregnation of the ovum.
Found on http://thinkexist.com/dictionary/meaning/polyspermy/

Polyspermy

Pol'y·sper`my noun (Biol.) Fullness of sperm, or seed; the passage of more than one spermatozoön into the vitellus in the impregnation of the ovum.
Found on http://www.encyclo.co.uk/webster/P/124

Polyspermy

An unusual occurrence in which one egg is fertilized by more than one sperm.
Found on http://www.pregnology.com/Pregnancy-dictionary/

polyspermy

Penetration of more than one spermatozoon into an ovum at time of fertilization. Occurs as normal event in very yolky eggs (e.g. Bird), but then only one sperm fuses with egg nucleus. Many other eggs have mechanisms to block polyspermy. ... (18 Nov 1997) ...
Found on http://www.encyclo.co.uk/local/20973

polyspermy

polyspermy Related topics utilizing this poly- prefix: Polysemy and Polysemous and Polygamy Sections.
Found on http://www.wordinfo.info/words/index/info/view_unit/2804/14

polyspermy

polyspermy, polyspermic The penetration of multiple sperms (spermatozoa) into a single ovum at the time of fertilization.
Found on http://www.wordinfo.info/words/index/info/view_unit/2804/15

polyspermy

Type: Term Pronunciation: pol′ē-sper′mē Definitions: 1. The entrance of more than one sperm into the oocyte. Synonyms: polyspermia1, polyspermism
Found on http://www.medilexicon.com/medicaldictionary.php?t=71109
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