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  2. Biology and sexual orientation - Wikipedia

    en.wikipedia.org/wiki/Biology_and_sexual_orientation

    By way of analogy, the allele (a particular version of a gene) which causes sickle cell disease when two copies are present, also confers an adaptive advantage when one copy is present by providing resistance to malaria with non-symptomatic sickle cell trait—which is known as "heterozygote advantage".

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