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Variation in gene frequencies within populations can occur by chance rather than by natural selection. This is referred to as
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genetic drift
Genetic drift is a random change in allele frequencies over the generations. It is brought by chance alone. Gene flow or gene migration is the physical movement of alleles into and out of a population.
The existence within the population of disadvantages alleles in heterozygous genotypes is known as genetic code.
The existence within the population of disadvantages alleles in heterozygous genotypes is known as genetic code.
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