The ultimate source of allelic variations in a population is:
1. Recombination
2. Mutation
3. Genetic drift
4. Gene flow
Subtopic:  Population Genetics |
 56%
Level 3: 35%-60%
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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
Subtopic:  Population Genetics | Genetic Basis of Adaptation | Hardy Weinberg Law |
Level 3: 35%-60%
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