Genetic drift is a ____ change in allele frequency that occurs due to ____. Even ____ alleles can be passed on. A/An ____ example of genetic drift is the founder effect and bottleneck effect. Natural selection is a ____ change in allele frequency that occurs due to the presence of ____ in different ____. It is directional as the frequency of alleles will always ____ in favor of the ____ alleles. A ____ population migrates away to start a new population elsewhere. The gene pool of this population is ____ of the gene pool of the original population. Just by chance, several members of this new population carries the allele for a mutated form of the ____ gene. Due to religious and cultural ____ between them and the local inhabitants, they practiced ____, which ____ the mutated allele in the population. Overtime, this population will be analogous to ____ There is ____ in the gene pool of a population. Due to ____ of offsprings, there is limit to the ____ available. This leads to competition, or how Darwin coined it, a ____. As different environments have different challenges, or ____, some individuals have a ____ chances of surviving and passing on the favourable ____ to the next generation of offsprings. These individuals are said to have a ____. The frequency of advantageous alleles will then increase in the gene pool.

Genetic drift

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