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Lecture

ANTHR101 Lecture Notes - Speciation, Natural Selection, Heredity


Department
Anthropology
Course Code
ANTHR101
Professor
Dan Syrotuik

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of 1
Natural Selection
Species gradually change to suit their environment
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Speciation
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Darwin concluded the following:
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In order for NS to occur, traits must be genetically inherited
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Cannot occur unless there is variation between individuals. W/O variation there is always the same characteristics passed on from generation
to generation. W/O variation species can't change.
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Fitness: a measure of how adapted you are to your environment
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Sometimes adapting to your environment isn't necessarily beneficial throughout life - what once may have given a species an edge may turn
out to be very limiting.
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Why and how species change.
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Wallace
A trait must be inherited to have importance in natural selection
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Natural selection cannot occur w/o variation
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Fitness is a relative measure that will change as the environment changes
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Fitness is simply understood as differential reproductive success
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Darwin Conclusions
Where intraspecies variations come from
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How heredity works
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Modern Synthesis *
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Mendell: first discovered heredity -> used basic math in biology to make discovery
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What Darwin Didn't Know
Height of stem
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Position of flower
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Color of Pea (yellow or green peas)
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Pea Plant -> Mendell (7 different characteristics)
Sep 12,
2012
Sep 12/12: Natural Selection
September-14-12
7:35 AM
ANTH 101 Page 1