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Test 1, 2007
Test 1, 2007

... Part 2: All students must answer this question. You and your lab partner decide to test several members of the Borden family, who are depicted in the pedigree below, for the presence of an RFLP associated with high susceptibility to MODI-1 Type 2 Diabetes (the trait depicted in the pedigree). Each f ...
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A pesticide that was rarely used in 1932 was used with increasing

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Biology Study Guide CH 11 Introduction To Genetics Sections 1-3

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Genetics Syllabus.pages - Maranacook Area Schools
Genetics Syllabus.pages - Maranacook Area Schools

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Am J Hum Genet

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The hitch-hiking effect of a favourable gene
The hitch-hiking effect of a favourable gene

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Genetic Algorithms
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Deducing Genotypes - Life is a journey: Mr. T finding his way

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Introduction to Genetics using Punnett Squares
Introduction to Genetics using Punnett Squares

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Mechanisms of Evolution

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File - Mr. Shanks` Class

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Exploring Mendelian Genetics
Exploring Mendelian Genetics

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Genetic drift



Genetic drift (or allelic drift) is the change in the frequency of a gene variant (allele) in a population due to random sampling of organisms.The alleles in the offspring are a sample of those in the parents, and chance has a role in determining whether a given individual survives and reproduces. A population's allele frequency is the fraction of the copies of one gene that share a particular form. Genetic drift may cause gene variants to disappear completely and thereby reduce genetic variation.When there are few copies of an allele, the effect of genetic drift is larger, and when there are many copies the effect is smaller. In the early twentieth 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 drift plays at the most a minor role in evolution, and this remained the dominant view for several decades. In 1968, Motoo Kimura rekindled the debate with his neutral theory of molecular evolution, which claims that most instances where a genetic change spreads across a population (although not necessarily changes in phenotypes) are caused by genetic drift. There is currently a scientific debate about how much of evolution has been caused by natural selection, and how much by genetic drift.
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