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| {{unreferenced|date=July 2013}}
| | Marvella is what you can call her but it's not the most female name out there. To gather cash is 1 of the things I adore most. For years he's been living in North Dakota and his family enjoys it. Since she was 18 she's been operating as a receptionist but her promotion never comes.<br><br>Feel free to surf to my web site: [http://www.noonptm.com/fox/upload/index.php?do=/profile-3715/info/ http://www.noonptm.com] |
| The '''General Selection Model''' (GSM) is a model of [[population genetics]] that describes how a population's [[allele frequencies]] will change when acted upon by [[natural selection]].
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| ==Equation==
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| The General Selection Model applied to a single gene with two alleles (let's call them A1 and A2) is encapsulated by the equation:
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| <math>\Delta q=\frac{pq \big[q(W_2-W_1) + p(W_1 - W_0)\big ]}{\overline{W}}</math> | |
| :where:
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| ::<math>p</math> is the frequency of allele A1
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| ::<math>q</math> is the frequency of allele A2 | |
| ::<math>\Delta q</math> is the rate of evolutionary change of the frequency of allele A2
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| ::<math>W_0,W_1, W_2</math> are the [[fitness (biology)|relative fitnesses]] of homozygous A1, heterozygous (A1A2), and homozygous A2 genotypes respectively.
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| ::<math>\overline{W}</math> is the mean population relative fitness.
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| In words:
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| The product of the relative frequencies, <math>pq</math>, is a measure of the genetic variance. The quantity pq is maximized when there is an equal frequency of each gene, when <math>p=q</math>. In the GSM, the rate of change <math>\Delta Q</math> is proportional to the genetic variation.
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| The mean population fitness <math>\overline{W}</math> is a measure of the overall fitness of the population. In the GSM, the rate of change <math>\Delta Q</math> is inversely proportional to the mean fitness <math>\overline{W}</math>—i.e. when the population is maximally fit, no further change can occur.
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| The remainder of the equation, <math> \big[q(W_2-W_1) + p(W_1 - W_0)\big ]</math>, refers to the mean effect of an allele substitution. In essence, this term quantifies what effect genetic changes will have on fitness.
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| ==See also==
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| *[[Fitness (biology)|Darwinian Fitness]]
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| *[[Hardy-Weinberg principle]]
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| *[[Population genetics]]
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| [[Category:Population genetics]]
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Marvella is what you can call her but it's not the most female name out there. To gather cash is 1 of the things I adore most. For years he's been living in North Dakota and his family enjoys it. Since she was 18 she's been operating as a receptionist but her promotion never comes.
Feel free to surf to my web site: http://www.noonptm.com