EEMB 2290 Study Guide - Midterm Guide: Assortative Mating, Allele Frequency, Genetic Drift
26 Apr 2018
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Introduction to Evolution
Reading list # 2
Vocabulary:
Microevolution change in the allele frequencies in a population
Macroevolution Evolutionary change on a grand scale: the origin of new taxonomic groups,
evolutionary trends, adaptive radiation, speciation and mass extinctions
Blending inheritance
Gene frequencies in a population
Meiosis After meiosis you have new combinations of alleles but these combinations are based on
the same number of alleles.. So the allele frequency does not change
independent assortment, random fertilization, crossing over, genetic variability
p+q=1 (allele frequencies)
Hardy-Weinberg Theorem
Assumptions of Hardy-Weinberg Theorem
p2+2pq+q2=1 (genotype frequencies)
Migration = Gene flow genetic exchange due to migration of fertile individuals or gametes between
populations. Extensive gene flow tends to …. reduce differences between populations. If extensive
enough, gene flow can amalgamate neighboring populations into a single population with a common
genetic structure.
Genetic drift occurs when changes in gene frequencies from one generation to another occur because
of chance events (sampling errors) that occur when populations are finite in size. The smaller the
sample, the greater the chance of deviation from an idealized result.
Very large population size
No migration
No net mutation
No assortative mating= random mating
No differential reproduction success
No genetic drift
find more resources at oneclass.com
find more resources at oneclass.com
Document Summary
Microevolution change in the allele frequencies in a population. Macroevolution evolutionary change on a grand scale: the origin of new taxonomic groups, evolutionary trends, adaptive radiation, speciation and mass extinctions. Meiosis after meiosis you have new combinations of alleles but these combinations are based on the same number of alleles So the allele frequency does not change independent assortment, random fertilization, crossing over, genetic variability p+q=1 (allele frequencies) Migration = gene flow genetic exchange due to migration of fertile individuals or gametes between populations. Extensive gene flow tends to . reduce differences between populations. If extensive enough, gene flow can amalgamate neighboring populations into a single population with a common genetic structure. Genetic drift occurs when changes in gene frequencies from one generation to another occur because of chance events (sampling errors) that occur when populations are finite in size. The smaller the sample, the greater the chance of deviation from an idealized result.
