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Genetic Tropes

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An index concerned with tropes about genes and biological heritage.


General tropes

Genetics-related Twin Tropes

  • Always Identical Twins: When twins of the same sex are mentioned in fiction, they are almost always identical, not fraternal.
  • Conjoined Twins: Twins who are born fused to each other, sharing the same body.
  • Half-Identical Twins: Brother-sister (i.e., fraternal) twins act identical in all ways other than sex.
  • Hereditary Twinhood: "Being a twin" is treated like a genetic pre-disposition such that being a twin almost guarantees one's children or grandchildren will also be twins or that one has twin ancestors.
  • Same-Sex Triplets: A set of triplets is more often than not all identical and of the same sex.