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Genetic drift is an evolutionary change in allelic frequencies of a population as a matter of chance. It occurs in small populations and can lead to the loss or fixation of alleles. Learn about the types (bottleneck and founder effect), causes and examples of genetic drift.
Gene flow is the transfer of genetic material from one population to another, which can affect genetic variation and speciation. Learn about the factors affecting gene flow, such as mobility, and the types of gene flow, such as horizontal and vertical, with examples and quiz.
Genetic drift may result in the loss of some alleles (including beneficial ones) and the fixation, or rise to 100\% 1 0 0 % 100, percent frequency, of other alleles. Genetic drift can have major effects when a population is sharply reduced in size by a natural disaster ( bottleneck effect ) or when a small group splits off from the main ...
Learn how evolution occurs due to natural selection, gene mutations, genetic drift, recombination and gene flow. Understand the Hardy Weinberg Principle and its factors that affect gene frequency in a population.
Microevolution is the change in allele frequency over a period of time in a specific population. It is caused by mutation, genetic drift, gene flow and natural selection. Learn the examples, causes and differences between microevolution and macroevolution.
Genetic drift : It is a mechanism by which evolution develops over generations. It is due to a change in allele frequencies of a population that occurs by chance. Causes of Genetic drift : Genetic drift usually occurs in populations of few members. A small population has many alleles, and if any of the alleles become extinct it will lead to ...
Genetic drift is a change in allele frequency in a population, due to a random selection of certain genes. Sometimes the change in allele frequency is so different in the new sample of population that they become a different species. The original drifted population becomes founders and the effect is called founder effect.
Genetic variation is the change in the genetic makeup of organisms within a population. It can be caused by mutation, sexual reproduction, gene flow and other factors. Learn about the types, causes and examples of genetic variation with FAQs.
Learn the definition, assumptions, infringements and applications of the Hardy Weinberg principle, which states that genotype and allele frequencies remain constant in a large, random-mating population. Find out how to calculate genotypic frequencies and test for population stratification using the Hardy Weinberg equation.
Organic evolution is the change in the genetic makeup of species in response to environmental changes. Learn about the theories of Darwin and Lamarck, the mechanism of natural selection, mutation and gene flow, and the paleontological evidence of evolution.