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Lecture 13

Biology 1001A Lecture 13: LEC 13 - Selection and Fitness.pdf


Department
Biology
Course Code
BIOL 1001A
Professor
Tom Haffie
Lecture
13

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Evolution textbook
i) Chapter 13, pg 244-249.
"Population genetics and gene frequencies in populations"
"Populations, allele frequencies and the gene pool"
"Measuring allele frequencies".
ii) Review pg 371-372 ("Basic research: using the Hardy-Weinberg principle")
Table 16.1 (pg 369) in Biology: EDL.
Chapter 13
Evolution: phenomenon that can be represented as a change in
gene (allele) frequency due to actions of various natural forces
(mutation, selection, genetic drift)
Population genetics: deals with gene/allele frequencies
Allele frequencies: frequencies of individual alleles
Gene pool: all alleles of all individuals in a population
Parents represent random sample of gene frequencies
in population
1.
Genes separate normally into gametes
2.
Parents equally fertile
3.
Gametes equally fertile (all have equal chance for of
becoming a zygote
4.
Population is large
5.
Mating is random
6.
Gene frequencies are the same in both male and female
parents
7.
All genotypes have equal reproductive ability
8.
Assumptions:
Hardy-Weinberg principle: pop of randomly mating individuals,
allele frequencies, are conserved, and in equilibrium unless an
external force acts upon them
Population Genetics and Gene (allele) Frequencies in
Populations
Usually taken to be a local group deme
Species can contain many demes that don’t interbreed with
one another, so each deme has different gene frequencies
Populations, Allele Frequencies and the Gene Pool
Measuring Allele Frequencies
Pre-Lecture Questions
Deme: local population of organisms of one species that
interbreed w/ one another and share distinct gene pool
Population: group of sexually interbreeding/potentially
interbreeding individuals
Allele frequency: frequencies of individual alleles within a
given population
Genotype frequencies: frequencies of genotypes within a
given population
1.
2.
Do practice questions
3.
Do practice questions
Parents represent random sample of gene frequencies in
population/mating is random
I.
Genes separate normally into gametes
II.
All genotypes/parents equally fertile
III.
Gametes equally fertile (all have equal chance for of
becoming a zygote
IV.
Assumptions of Hardy-Weinberg equilibrium
4.
LEC 13 - Selection and Fitness
November-13-12
9:23 PM
Pre - Lec Page 1
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