Factors affecting evolution of species Flashcards
1
Q
What is stabilising selection?
A
eliminates the extremes within a population
2
Q
What is genetic drift?
A
- Random change in the allele frequency of a population
3
Q
What is founder effect?
A
- the loss of genetic variation due to the establishment of a new ppulation
4
Q
What is directional selection?
A
- favours individuals at the extreme in a range of variation
5
Q
What is genetic bottleneck?
A
- a chance event causes a dramatic,reduction in the size of the population and gene pool.
6
Q
What is speciation?
A
- Evolution of a new species from an existing one
