BIO152H5 Chapter Notes - Chapter 23: Allele Frequency, Genotype Frequency, Gene Duplication

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raspberryjellyfish217

4 Dec 2016

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Natu(cid:396)al selectio(cid:374) acts of i(cid:374)di(cid:448)iduals: each o(cid:396)ga(cid:374)is(cid:373)"s t(cid:396)ait affect its o(cid:449)(cid:374) su(cid:396)(cid:448)i(cid:448)al a(cid:374)d reproductive success compared with other individuals. The evolutionary impact of natural selection is only apparent in the changed in a population of organisims over time. Changes in the allele frequencies in a population over generations. Natural selection is not the only cause of microevolution. 3 main mechanisms that cause allele frequency change: natural selection, genetic drift (chance events that effect allele frequencies), and ow (the transfer of alleles between populations). Darwin proposed natural selection as the primary mechanism for that change. Variation in heritable traits was a prerequisite for evolution. Genetic variation: differences among individuals in the composition of their genes or other dna segments. Phenotype is the product of an inherited genotype and many environment influences. Discrete characters determined by a single gene locus with different alleles that produce distinct phenotype.

Related Questions

One common misconception about evolution is that individual organisms evolve. It is true that natural selection acts on individuals: Each organism's traits affect its survival and reproductive success compared with those of other individuals. But the evolutionary impact of natural selection is only apparent in the changes in a population of organisms over time.

Using at least two examples, explain how the process of evolution is revealed by the imperfections of living things. Provide evidence based facts.