Bio Evolution

Página 1

Lamarck proposed theory of acquired traits

Natural selection developed by Charles Darwin

natural selection is governed by a few factors---must produce more offspring than can survive

variation in a species must occur

helpful variations make up more of a population over time

Macroevolution has two types: Gradualism (gradual over long periods of time) and Punctuated Equilibrium (major sudden changes) Environmental changes can happen during punctuated equilibrium these include things like volcanic eruptions and floods.

most proof comes from fossils (imprints, casts, Replacements, frozen, preserved) using relative dating (soil layers) and radioactive dating (half lives)

Molecular examples of this come from changing genes, there are more amino acid sequence changes as you get farther away from humans.

Comparing anatomy using homologous structures (human/octopus eye) and vestigal structures (human tailbone or whale hip), that have no use.

Página 2