(A) Stabilizing selection (B) Directional selection (C) Disruptive selection (D) Genetic drift (

step 1 The fact that most humans are born between six and nine pounds means that there are few individu

(A) Stabilizing selection (B) Directional selection (C)...

Key Concepts

Stabilizing Selection

Stabilizing selection is a type of natural selection where individuals with intermediate trait values have higher survival and reproductive success than those with extreme values. This process reduces phenotypic variation and maintains a consistent average trait value in a population over time.

Directional Selection

Directional selection occurs when natural selection favors individuals at one extreme of the trait distribution, leading to a shift in the population's trait mean over generations. This type of selection can result in a gradual evolution of a new trait optimum.

Disruptive Selection

Disruptive selection favors individuals at both extremes of the trait spectrum while selecting against intermediate forms. This can increase genetic and phenotypic diversity in a population and may even lead to the development of two distinct groups or ecotypes.

Genetic Drift

Genetic drift is an evolutionary mechanism that involves random fluctuations in allele frequencies, particularly in small populations. Unlike natural selection, genetic drift is not driven by fitness advantages but by chance events, which can lead to significant genetic changes over time.

Convergent Evolution

Convergent evolution describes the process where unrelated organisms independently evolve similar traits as a result of having to adapt to similar environments or ecological niches. This process highlights how similar selective pressures can shape analogous adaptations in distinct evolutionary lineages.

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