Gene flow is :
1. the emergence of new species from pre-existing species
2. the exchange of genes during fertilization
3. mating between close relatives
4. the movement of genes between species populations
Genetic drift is :
1. | random changes in gene frequency in a population |
2. | generational fluctuations in gene frequencies that produce no effect |
3. | changes due to interbreeding with other species populations |
4. | the effect of mutations as they spread through neighbouring populations |
The type of natural selection that operates to eliminate intermediate phenotypes in a population is known as:
1. | Directional selection | 2. | Disruptive selection |
3. | Stabilizing selection | 4. | Reverse selection |