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CMU - BIO 240 - Class Notes - Week 3

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CMU - BIO 240 - Class Notes - Week 3

School: Central Michigan University
Department: Biology
Course: Conservation of Natural Resources
Professor: Deric Learman
Term: Fall 2016
Tags: Biology, conservation, and Natural Resources
Name: BIO 240 - Chapter 3 (EXAM 1)
Description: Complete Notes for Chapter 3 9/12/16 - 9/19/16
Uploaded: 09/19/2016
This preview shows pages 1 - 3 of a 12 page document. to view the rest of the content
background image 9/8/16  Chapter    Lecture Presentations prepared by  Reggie Cobb  Nash Community College  Evolution,  Biodiversity, and  Population Ecology  © 2015 Pearson Education, Inc.  This lecture will help you understand:  How evolution influences biodiversity  Ecological organization  Population characteristics  Population ecology  © 2015 Pearson Education, Inc.  Central Case Study: Saving Hawaii’s Native  Forest Birds  'akiapōlā'au (“aki” for short)  Sparrow-sized honeycreeper birds that exist only on the 
Hawaiian Islands 
Human actions now threaten native species of flora 
and fauna 
Cutting down trees  Introducing non-native animals  Foreign disease spread to  
the islands 
Refuge managers  
and conservation biologists  
Work hard to protect the Hakalau’s forests.  © 2015 Pearson Education, Inc.  MONDAY LECTURE (9/12/16) (backbone of modern biology)
background image 9/8/16  Evolution: the source of Earth’s biodiversity     A population or group of populations whose members 
share characteristics and can breed with each other to 
produce fertile offspring 
   A group of individuals of a species that live in the same 
area at the same time 
      Biological evolution  Genetic change in populations over time  Genetic changes often lead to modifications in 
appearance or behavior 
© 2015 Pearson Education, Inc.  Natural selection shapes organisms and  diversity     The process whereby inherited characteristics that 
enhance survival and reproduction are passed on more 
frequently to future generations than those that do not 
   Example: Hawaii hosts  
a treasure of biological  
diversity 
© 2015 Pearson Education, Inc.  Evolution by natural selection     One of the best-supported and most illuminating 
concepts in science 
   It is vital for a full appreciation of environmental science     Evolutionary processes influence agriculture, pesticide 
resistance, medicine, health, etc. 
 
© 2015 Pearson Education, Inc.  Species Population Evolution (long or short term) Change over time Natural Selection A primary mechanism of evolution and biological diversity Evolution One of the best-supported and most illuminating 
concepts in science
Knowing ecology and learning the history of life
background image 9/8/16  Selection acts on genetic variation  Genes in DNA are passed along to future 
generations 
   Accidental changes in DNA that may be passed to the 
next generation 
Nonlethal mutations provide genetic variation on which 
natural selection acts 
Sexual reproduction also leads to genetic variation     © 2015 Pearson Education, Inc.  Natural selection shapes organisms  Premises of natural selection:     They produce more offspring than can survive  Individuals of a species vary in their characteristics 
because of genes and the environment  
      Characteristics that promote reproductive success  © 2015 Pearson Education, Inc.  Selection acts on genetic variation     Selective pressures among  
closely related species cause  
them to acquire different traits 
 
   Occurs when very unrelated  
species living in similar  
environments in separate  
locations independently acquire  
similar traits 
© 2015 Pearson Education, Inc.  WEDNESDAY LECTURE 9/14/16 Mutations Producing new combinations of genes Organisms struggle to survive and reproduce Some individuals are better suited for their 
environment and reproduce more effectively
Adaptations (adaptive traits) -ex. Galápagos finches Divergent Evolution Convergent Evolution

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School: Central Michigan University
Department: Biology
Course: Conservation of Natural Resources
Professor: Deric Learman
Term: Fall 2016
Tags: Biology, conservation, and Natural Resources
Name: BIO 240 - Chapter 3 (EXAM 1)
Description: Complete Notes for Chapter 3 9/12/16 - 9/19/16
Uploaded: 09/19/2016
12 Pages 20 Views 16 Unlocks
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  • 24/7 Homework help
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