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Some Recessive Mutations Can Be Exceedingly Debilitating or Lethal When

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Some recessive mutations can be exceedingly debilitating or lethal when expressed in homozygotes.If their effects are so severe,why doesn't natural selection simply purge such alleles from the population completely?


Definitions:

Emotional Expression

the verbal and nonverbal communication of feelings, including facial expressions, body language, and verbalizations.

Matching Task

A cognitive task that requires participants to associate two or more items according to specific criteria.

Startle Reflex

A sudden, automatic muscle reaction to a sudden, unexpected stimulus, such as a loud noise.

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Adverse experiences during childhood, including abuse and neglect, which can have long-term psychological and physical effects.

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