Chapter 22- Darwin and Natural Selection

Darwin's observations on his journey

Adaptation to the environment related to the origin of new species.

Natural Selection

The mechanism behind the evolution of species proposed by Darwin and Wallace.

Common Ancestor

All organisms must be related by a common ancestor, akin to a family tree.

Galapagos Finches

13 different species with varying beak characteristics studied by Peter and Rosemary Grant.

Beak Depth Measurements

In 1976 and 1978, measurements were taken to observe the relationship between food availability and finch beak depth.

Heritability

The hereditary component required for evolution to occur.

Darwin's Theory of Evolution

Change in species over time, driven by natural selection.

Microevolution

Evolution that occurs on a small scale, observable over short periods.

Endemic Species

Species that are found nowhere else in the world, often studied in the Galapagos.

Natural Selection Requirements

Requires heritable variation, differential survival, and reproduction.