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Heterogamy has a number of biological definitions:

In reproductive biology, heterogamy is the alternation of differently organized generations, applied to the alternation between parthenogenetic and a sexual generation.^[1]^[2] This type of heterogamy occurs for example in some aphids.
In reproductive biology, heterogamy or heterogamous is often used as a synonym of heterogametic, meaning the presence of two unlike chromosomes in a sex.^[3]^[4] For example, XY males and ZW females are called the heterogamous sex.
In cell biology, heterogamy is a synonym of anisogamy, the condition of having differently sized male and female gametes produced by different sexes or mating types in a species.
In botany, a plant is heterogamous when it carries at least two different types of flowers in regards to their reproductive structures, for example male and female flowers or bisexual and female flowers. Stamens and carpels are not regularly present in each flower or floret.
In sociology, heterogamy refers to a marriage between two individuals that differ in a certain criterion, and is contrasted with homogamy for a marriage or union between partners that match according to that criterion. For example, ethnic heterogamy refers to marriages involving individuals of different ethnic groups. Age heterogamy refers to marriages involving partners of significantly different ages. Heterogamy and homogamy are also used to describe marriage or union between people of unlike and like sex (or gender) respectively.

The terms heterogametic and homogametic are related to heterogamy, but distinct.

References

^ Scott, Thomas (1996). Concise encyclopedia biology. Walter de Gruyter. ISBN 978-3-11-010661-9.
^ Poinar, George O, Jr (2002-07). "Elaeolenchus parthenonema n. g., n. sp. (Nematoda: Sphaerularioidea: Anandranematidae n. fam.) parasitic in the palm-pollinating weevil Elaeidobius kamerunicus Faust, with a phylogenetic synopsis of the Sphaerularioidea Lubbock, 1861". Systematic Parasitology. 52 (3): 219–225. ISSN 0165-5752. PMID 12075153. {{cite journal}}: |access-date= requires |url= (help); Check date values in: |date= (help); Unknown parameter |coauthors= ignored (|author= suggested) (help)CS1 maint: multiple names: authors list (link)
^ Lokki, Juhani (1975-03-01). "Genetic Polymorphism and Evolution in Parthenogenetic Animals. Ii. Diploid and Polyploid Solenobia Triquetrella (lepidoptera: Psychidae)". Genetics. 79 (3): 513–525. Retrieved 2011-12-20. {{cite journal}}: Unknown parameter |coauthors= ignored (|author= suggested) (help)
^ Hiroki, Masato (2004-08-22). "Multiple infection with Wolbachia inducing different reproductive manipulations in the butterfly Eurema hecabe". Proceedings of the Royal Society B: Biological Sciences. 271 (1549): 1751–1755. doi:10.1098/rspb.2004.2769. ISSN 0962-8452. {{cite journal}}: Unknown parameter |coauthors= ignored (|author= suggested) (help).

[1] Scott, Thomas (1996). Concise encyclopedia biology. Walter de Gruyter. ISBN 978-3-11-010661-9.

[2] Poinar, George O, Jr (2002-07). "Elaeolenchus parthenonema n. g., n. sp. (Nematoda: Sphaerularioidea: Anandranematidae n. fam.) parasitic in the palm-pollinating weevil Elaeidobius kamerunicus Faust, with a phylogenetic synopsis of the Sphaerularioidea Lubbock, 1861". Systematic Parasitology. 52 (3): 219–225. ISSN 0165-5752. PMID 12075153. {{cite journal}}: |access-date= requires |url= (help); Check date values in: |date= (help); Unknown parameter |coauthors= ignored (|author= suggested) (help)CS1 maint: multiple names: authors list (link)

[Lokki-3] Lokki, Juhani (1975-03-01). "Genetic Polymorphism and Evolution in Parthenogenetic Animals. Ii. Diploid and Polyploid Solenobia Triquetrella (lepidoptera: Psychidae)". Genetics. 79 (3): 513–525. Retrieved 2011-12-20. {{cite journal}}: Unknown parameter |coauthors= ignored (|author= suggested) (help)

[4] Hiroki, Masato (2004-08-22). "Multiple infection with Wolbachia inducing different reproductive manipulations in the butterfly Eurema hecabe". Proceedings of the Royal Society B: Biological Sciences. 271 (1549): 1751–1755. doi:10.1098/rspb.2004.2769. ISSN 0962-8452. {{cite journal}}: Unknown parameter |coauthors= ignored (|author= suggested) (help).

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 {{Distinguish|heterozygosity}}
 '''Heterogamy''' has a number of biological definitions:
-*In reproductive biology, '''heterogamy''' is the alternation of differently organized generations, applied to the alternation between [[parthenogenesis|parthenogenetic]] and a [[sexual reproduction|sexual]] generation.<ref>{{Cite book| publisher = Walter de Gruyter| isbn = 978-3-11-010661-9| last = Scott| first = Thomas| title = Concise encyclopedia biology| year = 1996}}</ref><ref>{{Cite journal| issn = 0165-5752 | volume = 52| issue = 3| pages = 219–225| last = Poinar| first = George O, Jr| coauthors = Trevor A Jackson, Nigel L Bell, Mohd B-asri Wahid| title = Elaeolenchus parthenonema n. g., n. sp. (Nematoda: Sphaerularioidea: Anandranematidae n. fam.) parasitic in the palm-pollinating weevil Elaeidobius kamerunicus Faust, with a phylogenetic synopsis of the Sphaerularioidea Lubbock, 1861| journal = Systematic Parasitology| accessdate = 2011-12-20| date = 2002-07| url = http://www.ncbi.nlm.nih.gov/pubmed/12075153}}</ref> This type of heterogamy occurs for example in some [[aphid]]s.
+*In reproductive biology, '''heterogamy''' is the alternation of differently organized generations, applied to the alternation between [[parthenogenesis|parthenogenetic]] and a [[sexual reproduction|sexual]] generation.<ref>{{Cite book| publisher = Walter de Gruyter| isbn = 978-3-11-010661-9| last = Scott| first = Thomas| title = Concise encyclopedia biology| year = 1996}}</ref><ref>{{Cite journal| issn = 0165-5752 | volume = 52| issue = 3| pages = 219–225| last = Poinar| first = George O, Jr| coauthors = Trevor A Jackson, Nigel L Bell, Mohd B-asri Wahid| title = Elaeolenchus parthenonema n. g., n. sp. (Nematoda: Sphaerularioidea: Anandranematidae n. fam.) parasitic in the palm-pollinating weevil Elaeidobius kamerunicus Faust, with a phylogenetic synopsis of the Sphaerularioidea Lubbock, 1861| journal = Systematic Parasitology| accessdate = 2011-12-20| date = 2002-07| pmid=12075153}}</ref> This type of heterogamy occurs for example in some [[aphid]]s.
 *In reproductive biology, '''heterogamy''' or '''heterogamous''' is often used as a synonym of [[heterogametic]], meaning the presence of two unlike chromosomes in a sex.<ref name=Lokki>{{Cite journal| volume = 79| issue = 3| pages = 513–525| last = Lokki| first = Juhani| coauthors = Esko Suomalainen, Anssi Saura, Pekka Lankinen| title = Genetic Polymorphism and Evolution in Parthenogenetic Animals. Ii. Diploid and Polyploid Solenobia Triquetrella (lepidoptera: Psychidae)| journal = Genetics| accessdate = 2011-12-20| date = 1975-03-01| url =http://www.genetics.org/content/79/3/513.abstract}}</ref><ref>{{Cite journal| doi = 10.1098/rspb.2004.2769| issn = 0962-8452| volume = 271
 | issue = 1549| pages = 1751–1755| last = Hiroki| first = Masato| coauthors = Yohsuke Tagami, Kazuki Miura, Yoshiomi Kato| title = Multiple infection with Wolbachia inducing different reproductive manipulations in the butterfly Eurema hecabe.| journal = Proceedings of the Royal Society B: Biological Sciences| date = 2004-08-22}}.</ref> For example, XY males and ZW females are called the heterogamous sex.