Heterogamy


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heterogamy

[‚hed·ə′räg·ə·mē]
(biology)
Alternation of a true sexual generation with a parthenogenetic generation.
Sexual reproduction by fusion of unlike gametes. Also known as anisogamy.
(botany)
Condition of producing two kinds of flowers.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Heterogamy

 

(1) A type of sexual process in which two gametes fusing during fertilization are distinguished by their external form. In heterogamy in the narrow sense the gametes of both sexes differ in size but do not differ in form and behavior (for example, the mobile, flagellate gametes of some algae). A large gamete is called a macrogamete (egg cell), a small one is called a microgamete (spermatozoon), and both are called heterogametes or anisogametes. In a broader sense, heterogamy also includes oogamy (a process in all animals, all higher plants, and many lower plants), in which the egg cell and spermatozoon (sperm) differ in size, form, and behavior.

(2) The transmission to offspring by the male individual of genes or their combination that differ from those donated by the female parent (for example, in Oenothera). If both sexes give the identical combination of genes, the process is called homogamy.

(3) The change in functions of male and female flowers or in their position on the plant (as an anomaly).

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
White coat is one of the hair color characteristics mainly found in Hereford, Shorthorn, Belgian Blue, and Texas Longhorn breeds, and is expressed as the R/r+ type heterogamy allele (Seo et al., 2007).
Relationship qualities were associated with consistency of condom use even after social and demographic characteristics and other basic relationship features (e.g., duration and demographic heterogamy) were accounted for.
(48) The three barriers to heterogamy are described by inheritance, sectoral, and hierarchy parameters.
However, it definitely does not support the hypothesis of decreasing barriers to inter-class heterogamy over time.
On the contrary, some barriers to heterogamy actually seemed to become stronger at the end of the nineteenth century.
At the same time, educational homogamy is stronger than in Germany, while a far higher proportion of partnerships in Britain -- but also in Norway in 1980 -- when compared to Germany or Norway ten years previously -- are characterised by female superiority in education, producing a social distribution which can be described as "symmetrical heterogamy." The result -- in 1991 -- is a slightly more symmetrical transfer of educational benefits in Britain than in Germany.
As anti-semitism has declined, however, Jewish men who prefer intermarriage (heterogamy) now face a lower level of compensation to secure a non-Jewish spouse.
Perhaps the novel is saying that not all women who love women are congenital inverts, or that lesbians differ significantly from homosexual men in their nature and experiences, or that lesbians simply differ from one another in important ways - certainly Nora's almost religious faithfulness, Robin's tortured heterogamy, Jenny's parasitism are sufficiently distinct to keep us from reading the lesbian as a monolithic Other.
An examination of the relative social positions of spouses shows that heterogamy, the marriage of people from different social backgrounds, was not characteristic after World War II either.
But it is far less evident that this two-to-one ratio of homogamy to heterogamy constituted "tight alliance," let alone that it could have constituted the basis of an enduring social equilibrium in Florence, except in a safety-valve sort of way.
He candidly documents the many reasons why black women have resisted racial heterogamy, particularly with white men (pp.