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Lecture 3 - Département de mathématiques et de statistique
Lecture 3 - Département de mathématiques et de statistique

... Fresh genetic variation is introduced in the population by mutation. It is only trough this force that a sustained walk in the phenotypic space can be performed Mutation is a rare phenomenon: typical rates being of the order of 10-6 per gene, per individual, per generation. Thus, for example, if a t ...
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< 1 ... 1614 1615 1616 1617 1618 1619 1620 1621 1622 ... 1937 >

Microevolution

Microevolution is the change in allele frequencies that occur over time within a population. This change is due to four different processes: mutation, selection (natural and artificial), gene flow, and genetic drift. This change happens over a relatively short (in evolutionary terms) amount of time compared to the changes termed 'macroevolution' which is where greater differences in the population occur.Population genetics is the branch of biology that provides the mathematical structure for the study of the process of microevolution. Ecological genetics concerns itself with observing microevolution in the wild. Typically, observable instances of evolution are examples of microevolution; for example, bacterial strains that have antibiotic resistance.Microevolution over time leads to speciation or the appearance of novel structure, sometimes classified as macroevolution. Macro and microevolution describe fundamentally identical processes on different scales.
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