microevolution
Tags
bio/eco
cegep/3
Word count
104 words
Reading time
1 minute
Evolution with changes in allele frequencies but no new species
[!example] Tibetans evolve to have low concentration of blood cells to reduce blood clots.
Agents
- Mutation
- Natural selection
- Gene flow between populations through migration
- Genetic drift: random force that has limited influence on small populations
- Founder effect: inheritance from a few founders of an isolated population
E.g.Ellis-van Creveld syndrome in the AmishE.g.Leigh syndrome in French Canadians
- Bottleneck effect: random elimination by catastrophic event
- => reduced genetic diversity
- Founder effect: inheritance from a few founders of an isolated population
- Nonrandom breeding
- <= homozygote is usually less fit
Ajitani Hifumi