UW-Madison BIOLOGY 101 - Conservation and Sexual Selection (2 pages)

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Conservation and Sexual Selection



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Conservation and Sexual Selection

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Lecture number:
35
Pages:
2
Type:
Lecture Note
School:
University of Wisconsin, Madison
Course:
Biology 101 - Zoology 101: Animal Biology
Edition:
1
Documents in this Packet

Unformatted text preview:

Zoology101 Animal Biology Last Lecture Outline 1 Microevolution Lecture 35 Current Lecture 1 Conservation 2 Sexual selection Conservation Why are we concerned about small populations Population sizes of other organisms may be small Small populations experience greater effects of drift In small populations drift can actually become more important than selection habitat destruction modification degradation exotic species over harvest Bottleneck can introduce drift then small size maintenance high drift Loss of genetic variation accumulation of deleterious mutations positive feedback smaller population increased drift etc Case study impact of genetic drift on Greater Prairie Chickens Prairie chickens habitat destroyed in much of Illinois leads to greatly reduced population size Use DNA from museum specimens to quantify genetic variation Use data from field studies to compare reproduction Fitness consequences Sexual Selection Natural selection is related to mating Survival isn t enough genes must get into the next generation Darwin distinguished 2 types Intrasexual selection acts on traits that affect success in competition with members of your sex for mates Males competing against males Intersexual Selection Acts on traits that affect success in being chosen for mating by opposite sex Sexual dimorphism differences in size color shape and behavior between the sexes assess risk of cheating when in need for food Why might natural selection not produce perfectly adapted organisms Natural selection works upon available variation selection constrained by past selection doesn t have a plan not aware of the future Natural selection can vary in time and space Selection can be opposed by another microevolutionary source e g drift migration mutation There are no tradeoffs Not all variation is subject to natural selection Neurtal traits human finger prints Evolution by natural selection takes time rapid changes in environment may outpace the rate at which adaption can occur



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