Slide 12 Flashcards
1
Q
If fitness is greater than 1, what does this tell you about the allele
A
Beneficial!
2
Q
3 possible evolutionary forces that can influence genetic variation over time
A
- Drift
- Migration
- Mutation
3
Q
Four postulates of natural selection
A
- Individuals within populations vary in phenotype
- Phenotypic variation is heritable
- Struggle for ecological survival and reproduction
- Individuals with certain phenotypes will survive better than others, more likely to survive and reproduce, and thus contribute to next generation. So their alleles will increase in frequency in the population
4
Q
Testing postulates for finches (example for four postulates)
A
- Is the finch population variable for beak size
- Heritability for beak size?
- Struggle for existence?
- Survival and reproduction is not random
5
Q
3 types of selection
A
- Directional
- Stabilizing
- Disruptive
