Natural Selection - Mayr
Analysis by Ernst Mayr
Observation 1 : Populations can reproduce exponentially.
Observation 2 : Populations tend to remain constant.
Observation 3 : Natural resources are limited.
Inference 1: Individuals compete for resources and only a few survive.
Observation 4 : Traits of individuals vary.
Observation 5 : Much of the variations are heritable.
Inference 2: Some traits will give an individual advantages for survival.
Inference 3: Those individuals will likely have more offspring.
Inference 4: Characteristics of the population will change over time as natural selection favors some traits.
Concerning Natural Selection
- Natural selection acts on individuals, but allele frequencies change.
- Natural selection acts on individuals, but populations evolve.
- Natural selection doesn't predict the future.
- Natural selection is not random, but isn't progressive.
- Natural selection doesn't produce perfection.