Evolution - GenePools organisms(species...

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Gene Pools - all of the genes shared by a population of like  organisms  (species) - Individual genes in the pool may be represented  by alternate forms  (alleles)  that arise through  changes during reproduction - The frequency of the alternate forms of each  gene in the pool over time can 1 ) Remain stable -  genetic equilibrium 2) Change - evolution
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What is a  species ? A population or group of populations… of organisms… …that can successfully interbreed  to produce fertile offspring ( ie  species share gene pools).
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How do new alleles arise in a  population? New (alleles) arise thru  mutations  (changes in DNA  sequence) in individuals of the population.    Mutations  can come from: 1) change(s) to genes caused by external      agents (ie:  mutagens ) 2) change(s) to genes from parent to offspring  introduced before or during reproduction - Mutations ( in terms of fitness) can be - Beneficial - Neutral - Deleterious (or even lethal)
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Genetic Equilibrium - when a population is not evolving relative to a gene or its  alleles or all genes and their alleles.   Q:  Is genetic equilibrium possible for a population sharing a  gene pool. A:  Only in theory, but would require  4 conditions  to be met: 1) no new mutations 2) No loss of alleles due to drift 3) no new outside members 4) equal, random mating in large populations
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Evolution: Equilibrium disruption  (4 ways) 1.  Mutations -  change s in the base pair sequence of an individual’s DNA (gene point mutations,  rearrangements, loss, or duplication)   2.  Genetic Drift-
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This note was uploaded on 05/23/2011 for the course BIO 101 taught by Professor Lanno during the Spring '08 term at Ohio State.

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Evolution - GenePools organisms(species...

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