Evolution. Descent with Modification: A Darwinian View of Life. Evolution Defined . Evolution : gradual hereditary changes in groups of living organisms over time. . November 24, 1859. Lamarck’s Theory. Jean Baptiste de Lamarck , 1809
Descent with Modification: A Darwinian View of Life
Evolution: gradual hereditary changes in groups of living organisms over time.
November 24, 1859
Fossils: remains and traces left behind by organisms
-most direct evidence for evolution
-provides a record of ancient organisms that have existed
-able to generate a timeline
-ancestral descent and lineages can be generated
Types of Fossils: imprints, hair, nails, tissue, and other remains
Locations: sedimentary rock, ice, amber, tar, quicksand,
Types of Structures:
3. Struggle to Survive- members of a species compete for food, habitat, etc. (limits population)
4. Reproduction- individuals that are best adapted to their environment are likely to have many offspring that survive.
Natural selection- “survival of the fittest”- The species most fit for their environment will survive to pass on their traits.
Darwin’s Theory of Natural SelectionWhat Is Natural Selection? Darwin proposed the theory that evolution happens through a process that he called natural selection. Individuals that are betteradapted to their environment survive and reproduce more successfully than less well adapted individuals.
peppered moth activity