BIO1130 Microevolution - Microevolution In this lecture...

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Page 1 Microevolution BIO1130 Organismal Biology Université d’Ottawa / University of Ottawa 2:23 PM BIO1130 Organismal Biology 1 Microevolution Université d’Ottawa / University of Ottawa 2:23 PM BIO1130 Organismal Biology 2 In this lecture topic What is microevolution? Allele frequencies and evolution – Hardy- Weinberg. Sources of variations in alleles. What is a species? Université d’Ottawa / University of Ottawa 2:23 PM BIO1130 Organismal Biology 3 Important stages in the history of Biology 19th century: Modern biology Darwin (1809-1882) Wallace (1823-1913) Université d’Ottawa / University of Ottawa 2:23 PM BIO1130 Organismal Biology 4 Darwin’s five theories No constancy of species Common ancestry Gradual changes Population change (multiplication of species) Natural selection Université d’Ottawa / University of Ottawa 2:23 PM BIO1130 Organismal Biology 5 Mendel (1822-1884) Rediscovered 1900. Law of segregation of characters Law of independent assortment Université d’Ottawa / University of Ottawa 2:23 PM BIO1130 Organismal Biology 6 Important stages in the history of Biology 20th century Synthetic theory of evolution Population genetics and natural selection based on Mendelian genetics Huxley (1887-1975)
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Page 2 Microevolution BIO1130 Organismal Biology Université d’Ottawa / University of Ottawa 2:23 PM BIO1130 Organismal Biology 7 Microevolution Evolutionary changes that result from changes in allele frequencies in a population, or in chromosome structure or numbers due to mutation and recombination. Université d’Ottawa / University of Ottawa 2:23 PM BIO1130 Organismal Biology 8 Some basic terms for microevolution Allele Phenotype Genotype Homozygous Heterozygous Dominant and recessive Université d’Ottawa / University of Ottawa 2:23 PM BIO1130 Organismal Biology 9 Incomplete dominance – snap dragons C R C R Red C W C W White X C w C R Pink C R C R = 25% C w C R = 50% C W C W = 25% X P - parental F 1 – Generation1 F 2 – Generation2 Figure 11.13 Genotype and allele frequencies Phenotype Genotype Number Genotype frequency Total C R alleles Total C W alleles C R C R 450 450/1000 = 0.45 2x450 = 900 0X450 = 0 C R C w 500 500/1000 = 0.50 1x500 = 500 1x500 = 500 C W C W 50 50/1000 = 0.05 0x50 = 0 2x50 = 100 Total 1000 0.45 + 0.50 + 0.05 = 1.0 1400 p = 0.7 600 q = 0.3 2:23 PM 10 BIO1130 Organismal Biology Université d’Ottawa / University of Ottawa 2:23 PM BIO1130 Organismal Biology 11 Using the Hardy-Weinberg Principle C R frequency p=0.7 C W frequency p=0.3 C R frequency p=0.7 C W frequency p=0.3 C R C R = p 2 C R C W = pq C w C R = pq C W C W = q 2 p 2 +2pq+q 2 = 1 Université d’Ottawa / University of Ottawa 2:23 PM BIO1130 Organismal Biology 12 36 48 16 0 15 30 45 60 AA Aa aa Allele frequencies in populations (Each of the 20 adults produces 10 gametes) 36 48 16 0 15 30 45 60 AA Aa aa Final allele frequencies A 0.6 a 0.4 Number of zygotes Number of juveniles Number of adults 36 48 16 0 15 30 45 60 AA Aa aa A: 2x36 + 48 = 120/200 = 0.6 a: 48 + 2x16 = 80/200 = 0.4 Final = Initial frequency Initial allele frequencies in gametes A 0.6 a 0.4
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Page 3 Microevolution BIO1130 Organismal Biology Université d’Ottawa / University of Ottawa 2:23 PM
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This note was uploaded on 01/08/2012 for the course SCIENCE BIO1130 taught by Professor Fenwick during the Fall '11 term at University of Ottawa.

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BIO1130 Microevolution - Microevolution In this lecture...

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