BGYB51H3 Lecture 5 Notes Sep 24

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University of Toronto Scarborough
Biological Sciences
Maydianne Andrade

BGYB51H3 Lecture 5 Notes -in experiment with snails, no difference in survivorship with no crabs -with crabs, thicker shell snails have a higher survivorship -crabs impose natural selection on shell thickness of snails -an allele can cause higher blood saturation content than the average -individuals with higher blood saturation have decreased mortality in Tibet -strong natural selection on traits in humans that are heritable -patterns are broad scales of different taxon and involve macroevolution -processes involve microevolution and can lead to macroevolution changes -microevolution involves changes in populations across a few generations due to changes in gene frequencies -macroevolution involves the study of large phenotypic change and phylogenetic patterns over long periods using comparative method or fossil record -scientific method involving experiments (natural or planned) andor observational studies is used to analyze microevolution -microevolution involves a shorter time period involving changes in allele frequencies -macroevolution involves a longer time period involving changes across taxon -in experiments, there will be a distribution o
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