Random changes, and a good example of that I have right over here that we got from, I'll give proper credit, this is from OpenStax College Biology, and this shows how Genetic Drift could happen. When antigenic drift occurs, the body’s immune system may not recognize and prevent sickness caused by the newer influenza viruses. Genetic Drift Examples. D. industrial melanism. This change in the frequency of the allele or gene variation must occur randomly in order for genetic drift to occur. In a small population, genetic drift results in some alleles becoming more common while others becoming less over time; thus, it results in a seemingly drifting apart of the frequencies of genetic variants in a population. If the survivors of the original population survived by chance, then this event is an example of A. natural selection. Genetic drift, a change in the gene pool of a small population that takes place strictly by chance. There are no environmental influences that cause genetic drift to occur. When there are few copies of an allele, the effect of genetic drift is larger, and when there are many copies the effect is … Random changes. American bison were once very prevalent in North America but were hunted close to extinction in the late 1800's. Just by chance, the frequencies of the B alleles increase in the population over several generations (and the population moves into a valley in the adaptive landscape). Genetic drift definition is - random changes in gene frequency especially in small populations when leading to preservation or extinction of particular genes. 91 examples: Given enough time, genetic drift results in the fixation or loss of alleles at… Cambridge Dictionary Plus My profile It can also cause initially rare alleles to become much more frequent and even fixed. The founder effect is an extreme example of "genetic drift." Genetic Drift is really about random. genetic drift definition: The definition of genetic drift is a change in the genes of a group because of the random nature of reproduction. As a result, a person becomes susceptible to flu infection again, as antigenic drift has changed the virus enough that a person’s existing antibodies won’t recognize and neutralize the newer influenza viruses. C. founder effect. Genetic drift is a change in the frequency of an allele within a population over time. When the size of the population is reduced so quickly, many alleles are lost and the genetic variation of the population decreases. Genetic drift can result in genetic traits being lost from a population or becoming widespread in a population without respect to the survival or reproductive value of the alleles involved.

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