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Crossing Over and Independent Assortment Notes
Crossing Over and Independent Assortment Notes

... ­ In each pair, the chromosome of maternal origin is orientated towards one pole,  and the paternal chromosome is orientated toward the other pole. ...
Darwin`s Explanation: Natural Selection
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QTXb20
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DNA Day research - DNA model construction

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Genetic variation, genetic drift

... from chimpanzees approximately every 1/100 base pairs. From these observations, it would seem that the balance school wins out. However, the classical theory has been retained in terms of the so-called neutral (or neo-classical) theory. Also to consider is that some, or much, of the variation in nat ...
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CHAPTER 9

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< 1 ... 1735 1736 1737 1738 1739 1740 1741 1742 1743 ... 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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