Which of the following ideas does not underlie Kimura’s neutral theory of molecular evolution

High amounts of genetic variation segregate in natural populations.

Deleterious alleles are eliminated by means of (purifying) natural selection.

Mutation rates affect rates of substitution.

Evolutionary changes at the molecular level occur at a relatively constant rate.

Advantageous mutations occur often, and many fixation events are due to positive selection.

Advantageous mutations occur often, and many fixation events are due to positive selection. This is not a part of Kimura's neutral genetic drift but is a part of adaptive positive natural selection.

http://en.wikipedia.org/wiki/Neutral_the…