Heterogamy


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Related to Heterogamy: heterogamous

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.

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).

References in periodicals archive ?
Religious heterogamy and marital satisfaction: A comparison of interchurch and same-church individuals.
Meei-Shenn Tzeng (1992), "The Effects of Socioeconomic Heterogamy and Changes on Marital Dissolution for First Marriages", Journal of Marriage and Family, num.
In particular, there were increased and decreased heterogamy loss ratios in the groups at a certain locus.
Racial and ethnic heterogamy was a dichotomous measure generated by comparing the respondent's and partner's reported racial and ethnic groups.
Religious Heterogamy, Religiosity, and Marital Happiness: The Case of Catholics, 52 J.
Homogamy (same-sex unions) seems to me to best describe the relationship of two individuals of the same sex, similar to heterogamy for heterosexuals.
44) This apparent stability is all the more remarkable if we keep in mind that the data may be biased towards increasing heterogamy, as discussed in the data section.
In Norway, therefore, as in Britain, equality within couples has been achieved less within couples, by ever larger percentages of couples sharing intermediate education, as in Germany, but across couples through an increasingly symmetrical heterogamy.
One way to attempt to disentangle the influence of these three potential explanations for a sex difference in mortality is to study a species with (1) no SSD, and (2) where heterogamy and the male phenotype are not confounded, as is the case with mammals (males heterogametic).
The aura of eroticism that surrounds Alison, Sarah, Diana ("The Ebony Tower") and Isobel ("The Enigma") is lacking in Jane, who is an "emblem of a redemption from a life devoted to heterogamy and adultery" (596).