With each generation, some individuals survive to reproduce and pass on their genes, while others are eliminated. Over time, individual alleles can become more or less common in a population. When inherited characteristics determine who will survive and who will not, the process is called natural selection. When random factors determine who will survive, the process is called genetic drift. Through genetic drift, some alleles can entirely disappear from a population.
A small population is more susceptible to genetic drift than a large population. When just a few individuals carry a particular allele, it becomes more likely that just by chance those individuals will not reproduce, and the allele will be lost.
With each generation, some individuals survive to reproduce and pass on their genes, while others are eliminated. Over time, individual alleles can become more or less common in a population. When inherited characteristics determine who will survive and who will not, the process is called natural selection. When random factors determine who will survive, the process is called genetic drift. Through genetic drift, some alleles can entirely disappear from a population.A small population is more susceptible to genetic drift than a large population. When just a few individuals carry a particular allele, it becomes more likely that just by chance those individuals will not reproduce, and the allele will be lost.
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