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Overview:
This case study in the form of a set of PowerPoint slides examines the evolution of light fur in beach mice from the molecular level up to the population genetics level.Author/Source:
Evo-Ed Grade level:
13-16 Time:
one to two class periods Teaching tips:
This series of slides provides direct links to studies and data sets and integrates active learning strategies such as clicker questions, minute papers, and think/pair/share. Students could review the website or ppt slides before class and clicker questions/application questions could be source of class discussion. Concepts: - Natural selection and genetic drift act on the variation that exists in a population.
- Natural selection acts on phenotype as an expression of genotype.
- Phenotype is a product of both genotype and the organism’s interactions with the environment.
- Variation of a character within a population may be discrete or continuous.
- Continuous characters are generally influenced by many different genes.
- New heritable traits can result from mutations.
- Mutation is a random process.
- Organisms cannot intentionally produce adaptive mutations in response to environmental influences.
- Complex structures may be produced incrementally by the accumulation of smaller advantageous mutations.
- Inherited characteristics affect the likelihood of an organism’s survival and reproduction.
- Over time, the proportion of individuals with advantageous characteristics may increase (and the proportion with disadvantageous characteristics may decrease) due to their likelihood of surviving and reproducing.
- Traits that confer an advantage may persist in the population and are called adaptations.
- The number of offspring that survive to reproduce successfully is limited by environmental factors.
- Depending on environmental conditions, inherited characteristics may be advantageous, neutral, or detrimental.
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