Thursday, April 17

OBJECTIVE: Students will examine variation among organisms in order to recognize its importance in evolution.

WARM-UP: In what ways can organisms of the same species vary? (Think about the lima bean lab)

VOCABULARY:
1) survival of the fittest
2) natural selection
3) descent with modification
4) common descent
5) homologous structures
6) vestigial organ

CLASSWORK:
1) Warm-Up/Vocabulary
2) Review lima bean lab, bird and natural selection labs
3) Review 16-1 and 16-2

4) Discuss/Notes on natural selection as a mechanism for change
a. evolution occurs at population level
b. finite supply of resources required for life
c. genetic variation (mutations and recombination of genes)
d. selection of favored variations by environmental pressures
e. resulting offspring are more likely to survive and reproduce

a. Factors that influence natural selection (diet, climate,
weather, predators, and environment)
b. Natural selection leads to the development of a new species
c. Use of technology (gel electrophoresis) to determine
evolutionary relationships among species

5) BCR #34
6) Closure