In the Darwinian system, a species is a population of life forms that either does or does not perpetuate itself by reproducing, because a living generation is mortal . If it does it is selected for ; if it doesn’t it is selected against.
Darwin’s concept of selection only makes sense if a population is capable of reproducing.
The only way a sexually reproducing species can be selected for is by two animals of the opposite sex mating and producing fertile offspring ; so, the only populations that can be selected for are populations of animals of the opposite sex that mate and produce fertile offspring. Therefore , the only populations that can constitute a species in the Darwinian system are populations of animals of the opposite sex who mate and produce fertile offspring, who are selected for; who perpetuate their genomes.
A species must be able to perpetuate by producing offspring because living members are mortal. A species by definition has multiple generations . Sexually reproducing species produce multiple generations by members of the opposite sex mating by definition. Two animals that mate and produce fertile offspring are members of the same species by the definition of species in the Darwinian system .
Title of Darwin’s book should be the origin _and perpetuation_ of species .
AND IT IS !
Origin of Species by Means of Natural Selection or the Preservation of Favoured Races in the Struggle for Life.
Charles Brown
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P.S.
ONLY TWO INDIVIDUALS WHO CAN PRODUCE OFFSPRING CAN PERPETUATE THEIR GENOTYPES . ONLY A PERPETUATED GENOYTPE CAN BE A SPECIES.
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