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BIOC51H3 (51)
Lecture 18

BGYB51H3 Lecture 18 Notes Nov 10

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Department
Biological Sciences
Course
BIOC51H3
Professor
Maydianne Andrade
Semester
Fall

Description
BGYB51H3 Lecture 18 Notes -weak selection causes more distribution of traits while strong selection causes less distribution in traits -directional selection involves fitness increasing or decreasing with trait value increase -directional selection decreases variation -stabilizing selection is most common in stable environments and decreases variation in phenotype -stabilizing selection involves intermediate traits favoured -disruptive selection increases variation in populations and is involved in leading to divergence through speciation -quantitative trait selection and the mechanisms of evolution (mutation, gene flow, migration) cause speciation -species are evolutionary independent in that mechanisms of evolution produce different changes in different species -species consist of interbreeding populations, if sexual, because it shows that genotypes and phenotypes remain similar through gene flow and migration -new species formation involves isolation of populations so that there
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