Natural selection is favorable or positive when the selection value exceeds 1 (W
ID: 189107 • Letter: N
Question
Natural selection is favorable or positive when the selection value exceeds 1 (W>1). When a selection value is decreased for a specific genotype, it means that the genotype is being selected against (if W<1, then reproductive success decreases). In this scenario with A and B alleles: Population 1 has an inheritance pattern in which the B allele is only lethal in the homozygous form (BB) which is referred to as recessive lethal; Population 2 displays an ‘incomplete’ lethality of the BB genotype; Population 3 describes the case in which the heterozygote genotype (AB) has a higher relative fitness than either one of the two homozygotes (AA and BB).
Why would population 3 have the greatest highest fitness over time of the three populations?
Explanation / Answer
Because within population 3 the heterozygote has the higher relative fitness, therefore it will be positively selected over the homozygotes over time. As the other 2 populations show lethality of the homozygote BB, natural selection will favour the heterozygote over time, which would be the most frequent genotype on population 3 already.
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