Download Evolution and Natural Selection

Evolution and
Natural
Selection
Ms. Senff
Ag Biology
Yesterday’s Class…
 Define
Evolution

Change over time

Organism’s survival is dependent on their
phenotype (phenotype determined by
genotype)
Natural Selection Limbo!!
 Nature
selects traits best suited for the
environment.
 HYPOTHESIS:
What sort of physical traits will be
favorable for this game?
 RECAP:
What traits were present in the
students who could limbo the lowest?
 What
happens in nature to the students who
couldn’t limbo very low?
Objectives:
 After
completion of this lesson, students
will be able to:




Define evolution
Describe the role of natural selection and its
four main points
Model in a lab activity how competition for
food can be a driving force of natural
selection.
Brainstorm areas in agriculture where
evidence of natural selection is prevalent.
Natural Selection

Charles Darwin’s theory of a
mechanism for evolution;
organisms with traits
favorable for their
environment are more likely
to survive, reproduce, and
pass on the favorable traits
to offspring.

Examples in Agriculture??



Pesticide resistant insects on
crops
Birds
Reptiles
4 main points of Natural
Selection
1.
Variation within populations
1.
Some variations are favorable
1.
Not all young produced in each
generation can survive
1.
Individuals that survive and reproduce
are those with favorable variations.