Evolution Notes I. Darwin’s Voyage: sailed to the on the H. M.S. Beagle.
A. Darwin’s during his voyage led him to doubt his about the of species.
B. Darwin that new species formed by the slow of existing .
C. Darwin proposed that natural selection caused .
D. Natural : occurs because some have traits that their ability to survive or produce .
II. The Evidence for Evolution:
A. Fossil Record
1. Fossils are preserved of dead organisms. Fossils form only under specific conditions.
2. enables us to determine the ages of fossils.
3. The fossil record provides that older species gave to more species.
B. Homologous Structures: are structures that share a
.
-Homologous Structures are because they are versions of that occurred in common ancestors.
C. Vestigial Structure: are structures of remnants of an evolutionary past. These have function anymore.
Ex: Whale’s pelvis is evidence of its evolution from 4- legged, land dwelling animals.
D. Developmental Patterns show evolutionary relationships:
1. The old human embryo and the old chicken embryo each have a bony and pouches similar to .
E. DNA and Protein: Contain evidence of Evolution:
If we compare the of several species, closely related species will show more in sequence than will distantly related species.
IV. is the hypothesis that evolution occurs at a rate. is the hypothesis that evolution occurs at an rate.