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Genetic Tropes

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An index concerned with tropes about genes and biological heritage.


General tropes
  • All Genes Are Codominant: An interspecies hybrid baby ends up getting 50/50 genes.
  • Artificial Hybrid: Someone who was born one species, but turned into a hybrid.
  • Bioweapon Beast: An artificially-created creature made to be a living weapon
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  • Cloning Blues: A clone angsts over the fact that they are a genetic duplicate of another person.
  • Creature-Breeding Mechanic: In a game, the player breeds creatures until they have a necessary creature.
  • Darwinist Desire: Someone will only have sex with a person with the "right" DNA.
  • Designer Babies: Altering a fetus so the baby will be "perfect".
  • Dominant Species Genes: When species X and Y have kids, the kid is always an X.
  • Either/Or Offspring: When two species breed, you always get one or the other, never a hybrid.
  • Extra Y, Extra Violent: Men with an extra Y chromosome are violent, even though real life men with XYY syndrome are simply taller and more susceptible to learning disabilities.
  • Generational Magic Decline: Your magic is weaker than your father's, just as he is weaker than his father, who was weaker than his father, and so on and so on.
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  • Genetic Adaptation: Outsiders adapt to a hostile environment (such as that on other planets) by genetically modifying themselves.
  • Genetic Engineering Is the New Nuke: Weird story aspects are explained as being the result of genetic engineering.
  • Genetic Memory: An ability to record personal memories/skills into their genes and pass them onto their offspring.
  • Half-Human Hybrid: A being who is half-human and half-something that isn't human.
  • Hereditary Homosexuality: Homo- or bisexuality runs in families.
  • Hollywood Genetics: A biological family who doesn't look related.
  • Hybrid Power: If someone with superpowers and someone without have a kid, the kid always ends up with powers.
  • In the Blood: Personality traits, morality, and certain behaviors are passed down from generation to generation.
  • It Runs in the Family: Family members tend to have similar personalities.
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  • Lamarck Was Right: A character inherits a non-genetic trait from their parents.
  • LEGO Genetics: Mixing DNA can alter a person's body.
  • Magic Genetics: Genetic mutations can give you superpowers.
  • Mix-and-Match Critters: Taking two different animals and combining them into one.
  • Mix-and-Match Man: A clone created by combining DNA from two or more individuals.
  • Mutagenic Goo: Radioactive ooze that can instantly mutate whatever it touches.
  • Mutants: Genetically abnormal organisms that look significantly different from normal members of their species.
  • Nonhuman Humanoid Hybrid: A being who is a mixture of two different non-human species.
  • Patchwork Kids: Kids that have the combined physical features of their parents.
  • Recessive Super Genes: Superpowerful Genetics may skip generations.
  • Royal Inbreeding: Only having sex with blood relatives to keep the bloodline pure
  • Super Breeding Program: Breeding "better" people.
  • Superior Successor: A younger generation proves to be more competent than the previous one.
  • Superpowerful Genetics: A super-powered being will have children who inherit their powers.
  • Unstable Genetic Code: A genetic defect that causes random Involuntary Shapeshifting.
  • Villainous Lineage: Villainy runs in the family. : When characters are born into an evil family, they run the risk of becoming evil themselves.
  • Wrong Genetic Sex: A character's genetic sex doesn't match up with the gender that they appear to be.
  • Xeno Nucleic Acid: Alien lifeforms have a very different genetic structure when compared with terrestrial DNA.

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.
  • Same-Sex Triplets: A set of triplets is more often than not all identical and of the same sex.


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