BIO220H1 Chapter Notes - Chapter 1: Brassica Rapa, Phenotypic Trait, Standard Deviation
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BIO220H1 Full Course Notes
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Affects traits in natural populations: = new challenges for species to survive, (1) climate affects physiology/development of a species, climate change changes patterns in nat. selection. Evolutionary change can happen on short time scale. Goal: severe changes in climate, genetic variation exist in populations for traits influenced by climate, impose drought treatment on natural populations of annual plants, measure selection on size + flowering time. = trade-off btwn making thick leaves + losing water. Trade-off obvious in wet years: selective agents: climatic variables. = source of election on plants: target of selection: leaf thickness. = trait whose expression is influenced by selective agents. Patterns of selection + targets of selection change. Need 2 information to measure selection: measurements of trait that suspect is target of selection, estimates of reproductive success of individuals w/ each value of the trait. Need to decide what traits under selection. Plants in sample with anything from 50 to 100 leaves.
