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 Variation within populations Some variations are favorable Not all young produced in each generation can survive Individuals that survive and reproduce are those with favorable variations.