The nearly neutral theory proposed that:
a) effective population size is an important determinant of evolution
b) observed variation should be linearly associated with census population size
d) natural selection rarely operates in nature
Please explain how you got your answer:)
Because nearly neutral theory accounts for the fact that the mutations are not so deleterious such that they can be ignored or neutral . Slightly deleterious mutation are purged only when their selective coefficient are greater than 1 divided the effective population size . In larger population a large number of mutation cross this threshold , therefore drift predominates in small population and mutation in large population.
Further the variation is not linearly but curvilinearly associated and natural selection occurs continuously and not rarely.
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