Which of these is not a kind of selection directional stochastic disruptive stabilising

To determine which of the given options is not a kind of selection, we need to understand what each term refers to within the context of evolutionary biology.

1. Directional Selection: This occurs when individuals at one extreme of a phenotypic range have a higher fitness than those at the other extreme, leading to a shift in the population's trait distribution over time.

2. Stabilizing Selection: This form of selection favors the average phenotype and reduces variance, thus maintaining the status quo in a population and discouraging extremes.

3. Disruptive Selection: In this case, individuals at both extremes of a phenotype have higher fitness than average individuals, which can lead to the development of two distinct phenotypes within the population.

4. Stochastic Selection: This term is generally not recognized as a standard form of selection in evolutionary terms. "Stochastic" refers to randomness or processes governed by chance, but it does not specifically denote a type of selection as the others do.

Final Answer

Stochastic is not a kind of selection.