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Week 2 notes

by: Katlyn Burkitt

Week 2 notes Biol 202

Katlyn Burkitt
GPA 3.2
Intro to Ecology and Evolution
J. LaPolla

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About this Document

These are the notes of chapter 21 however they do not replace going to lecture as much was covered that cannot be translated into notes.
Intro to Ecology and Evolution
J. LaPolla
Class Notes
25 ?




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This 0 page Class Notes was uploaded by Katlyn Burkitt on Friday February 12, 2016. The Class Notes belongs to Biol 202 at Towson University taught by J. LaPolla in Spring 2016. Since its upload, it has received 21 views. For similar materials see Intro to Ecology and Evolution in Biology at Towson University.


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Date Created: 02/12/16
Chapter 21 Biology 0 Evolution by Natural Selection requires 0 1 Phenotypic variation must exist in the population 0 2 This variation must lead to differences among individuals in lifetime reproductive success 0 3 Phenotypic variation among individuals must be genetically transmissible to the next generation 0 Natural Selection occurs when there is a selecting factor that gives one phenotype an advantage 0 Examples in islands During droughts or dry years when the main type of seed available is large and tough the larger beaks hold the advantage During wet years small seeds are more available the smaller beaks hold the advantage Beak depth is genetic 0 Natural Selection can occur if something in the environment changes Example when pollution caused the trees in a forest to turn darker in color the population of black moths increased in relation to the population of quotpepperedquot moths The theory being that light colored moths were more easy for predators to see on the darkened trees which made their coloration unfavorable Industrial Melanism Refers to the phenomenon in which darker individuals come to predominate over lighter ones 0 Arti cial Selection Operates by favoring individuals with certain phenotypic traits allowing them to reproduce and pass their genes on to the next generation Domesticated breeds have arisen from arti cial selection 0 They managed to domesticate foxes by selecting the most docile of the parent generation 0 Their ears tails and legs also changed with their temperaments Homologous Structures 0 Structures with different appearances and functions that all derived from the same part of a common ancestor Most species are similar during the embryonic stage 0 Not all features are perfectly suited for their use Vestigial Structures 0 Structures that have no apparent function but resemble structures their ancestors possessed Fossil Genes or Pseudogenes 0 Genes that have been made inactive through some mutation however still remain a part of the organisms genome Convergent Evolution 0 Evolutionary change that occurs parallel in similar environments


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