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USF - BSC 2011 - Class Notes - Week 3

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USF - BSC 2011 - Class Notes - Week 3

School: University of South Florida
Department: OTHER
Course: Biodiversity
Professor: Chantale Begin
Term: Spring 2017
Tags: Macroevolution, DNA, reproduction, hybrids, speciation, and Evolutionary Biology
Name: Lesson 3 - Chapter 24 - January 25, 2017
Description: How species reproduce and what prevents them from reproducing
Uploaded: 01/28/2017
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background image January 25, 2017 Chapter 24 Reproductive isolation… IMPORTANT! If the Hardy Weinberg is = 1 then there is NO evolution I. Origin of new secies
Macroevolution: large scale changes, usually physical, and distinctively marks a change Defining species: o Morphological traits: what it looks like
o Ability to interbreed: can they give offspring
o Phylogenetic relationships: how the current species is related to the past species
o Ecological relationships: how the species behave in the environment
Ability to interbreed requires no arbitrary decision, meaning the investigator does not 
need to decide, the facts speak by themselves
Biological species concept: the ability of species to interbreed (this does not apply to        bacteria) Reproductive isolation: the only concept that completely changes (diverges) species into  different Thing preventing reproduction: o Geographical separation
o Behavioral difference
o Different mating times 
II. Reproductive isolating mechanisms
Prezygotic barriers: Prevents formation of zygote Postzygotic barriers: prevents reproduction after birth Hybrid: mix between 2 different species. III. Mechanism of speciation
Speciation: formation of new species At what point is that the species are different? With time the changes accumulate in the genes and at some point they outbreak Allopatric (allo­different, patric­homeland) speciation: the species have a different            location, geographical barrier 
          (Californian salamander)
o Gene flow stops DNA differences from accumulating
o Hybrid zone: where 2 species interbreed, can build on differences but not 
         necessarily completely different species Sympatric (same place) speciation: o Mating time
o Gametic isolation
o Different environment
o Selective mating
o Temporal isolation: the fruit flies and the apple story
o Polyploidy: plants, where they can alter their chromosome number while mating 
o Adaptation to local environment: maybe at some specific place something 
happened that changed the population and even in the same environment some 
species because of these varieties
o Sexual selection: some species prefer a specific type of mate IV. Evo­Devo

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School: University of South Florida
Department: OTHER
Course: Biodiversity
Professor: Chantale Begin
Term: Spring 2017
Tags: Macroevolution, DNA, reproduction, hybrids, speciation, and Evolutionary Biology
Name: Lesson 3 - Chapter 24 - January 25, 2017
Description: How species reproduce and what prevents them from reproducing
Uploaded: 01/28/2017
2 Pages 15 Views 12 Unlocks
  • Better Grades Guarantee
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  • Notes, Study Guides, Flashcards + More!
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