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About: Balanced lethal systems     Goto   Sponge   NotDistinct   Permalink

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In evolutionary biology, a balanced lethal system is a situation where recessive lethal alleles are present on two homologous chromosomes. Each of the chromosomes in such a pair carries a different lethal allele, which is compensated for by the functioning allele on the other chromosome. Since both these lethal alleles end up in the gametes in the same frequency as the functioning alleles, half of the offspring, the homozygotes, receive two copies of a lethal allele and therefore die during development. In such systems, only the heterozygotes survive.