Module 6: evolution part 1
Describe three ways in which natural selection can affect a population over time
- directional selection
- stabilizing selection
- Disruptive selection
In directional selection, the phenotype is favored over genotype causing allele to move in one direction and hence creating certain traits in an organism. The favored alleles are therefore dominant over the other alleles. For example, in a community that consist of bird with a length of 2cm and grain eater, after a long period and a change of food available the length of beak can change gradually. The dominant allele leads to the required change in the shape ...
