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Genetic drift
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Genetic drift is the change in the frequency of an existing allele in a population due to chance.
The Effects of Genetic Drift on Different Population Sizes
The Effects of Genetic Drift on Different Population Sizes
Changes in a population's allele frequency following a population bottleneck: the rapid and radical decline in population size has reduced the populat
Changes in a population's allele frequency following a population bottleneck: the rapid and radical decline in population size has reduced the population's genetic variation.
When very few members of a population migrate to form a separate new population, the founder effect occurs. For a period after the foundation, the sma
When very few members of a population migrate to form a separate new population, the founder effect occurs. For a period after the foundation, the small population experiences intensive drift. In the figure this results in fixation of the red allele.
Darwin's finches by Gould
Darwin's finches by Gould
Natural selection
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Natural selection is the differential survival and reproduction of individuals due to differences in the relative fitness endowed on them by their own particular complement of observable characteristi
Genetic drift
…where the initially rare allele displaces all others. In the middle of the 20th century, vigorous debates occurred over the relative importance of natural selection versus neutral processes, including genetic drift. Ronald Fisher, who explained natural selection using Mendelian genetics, held the view that genetic…
Aristotle considered whether different forms could have appeared, only the useful ones surviving.
Aristotle considered whether different forms could have appeared, only the useful ones surviving.
Modern biology began in the nineteenth century with Charles Darwin's work on evolution by natural selection.
Modern biology began in the nineteenth century with Charles Darwin's work on evolution by natural selection.
Part of Thomas Malthus's table of population growth in England 1780–1810, from his Essay on the Principle of Population, 6th edition, 1826
Part of Thomas Malthus's table of population growth in England 1780–1810, from his Essay on the Principle of Population, 6th edition, 1826
Charles Darwin noted that pigeon fanciers had created many kinds of pigeon, such as Tumblers (1, 12), Fantails (13), and Pouters (14) by selective bre
Charles Darwin noted that pigeon fanciers had created many kinds of pigeon, such as Tumblers (1, 12), Fantails (13), and Pouters (14) by selective breeding.