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Lecture 4

BIO SCI 94 Lecture Notes - Lecture 4: Genotype Frequency, Allele Frequency, Stabilizing Selection


Department
Biological Sciences
Course Code
BIO SCI 94
Professor
Nancy Aguilar- Roca
Lecture
4

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Lecture 4
1.14.19
REVIEW
Homologous traits
Same origin, Different function
Ex.
Front legs of a mouse and the wings of a bat
Modern definition of evolution
“Descent with modification”
Modification comes from mutations
If it enhances success...
May be passed through a population
If a population is in Hardy-Weinberg equilibrium then…
Observed genotype frequencies are similar to predicted genotype
frequencies
Selective Breeding
Leads to inbreeding
Medical problems = shorter lifespan
Conservation issues
Inbreeding patterns
True for a highly inbred population that does not violate Hardy-Weinberg
equilibrium...
Frequency of homozygotes increases→ allele frequencies do not change
Directional selection
Forces the average to move one way or another
Stabilizing selection
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