DARWIN’S BIG IDEA

THE VOYAGE OF THE BEAGLE 1831-1836

WHAT DARWIN SAW

DARWIN’S INFLUENCES Thomas Malthus

DARWIN’S INFLUENCES Charles Lyell

DARWIN’S INFLUENCES Farmers & Breeders – Artificial Selection

ARTIFICIAL SELECTION

ARTIFICIAL SELECTION

PUBLISHING HIS RESEARCH Alfred Russel Wallace “On the Origin of Species” - 1859

DARWIN’S BIG IDEA Natural Selection:

More organisms are born than can be supported by the environment.

Organisms compete for resources.Organisms have variation. Those with

variations that are well suited to the environment are more likely to survive and reproduce.

Small differences in each generation can add up to big differences over time.

TYPES OF NATURAL SELECTION Stabilizing Selection

TYPES OF NATURAL SELECTION Directional Selection

TYPES OF NATURAL SELECTION Disruptive Selection