What is required for the formation of new species?
Absence of gene flow
What are the 2 types of barriers?
- Prezygotic barriers
- Postzygotic barriers
What are the types of prezygotic barriers?
- Habitat
- Temporal
- Behavioral
- Mechanical
- Gametic
What occurs in habitat isolation?
Two species occupy different habitats
How does mechanical isolation occur?
Morphological differences prevent 2 species from mating
How does gametic isolation occur?
Sperm is not able to fertilize egg
What are the types of postzygotic barriers?
- Reduced hybrid viability
- Reduced hybrid fertility
- Hybrid breakdown
What are the 2 main ways that speciation can occur?
- Allopatric
- Sympatric
What are the 3 mechanisms that can lead to sympatric speciation?
- Polyploidy
- Habitat differentiation
- Sexual selection
What is polyploidy? What are the 2 types of polyploids?
- Condition that results in extra chromosomes
- Autopolyploid (all from same species) and allopolyploid (sets deriving from different species
What is a hybrid zone?
Area in which different species meet and mate
What are the 3 possible outcomes when 2 related species meet and mate in a hybrid zone?
- Strengthen reproductive barriers
- Weaken reproductive barriers
- Continued formation of hybrids
Punctuated equilibrium
Period of stasis for organism followed by sudden change
Speciation
Process by which one species splits into two
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Bio I Evolution 4.1-4.228
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Chapter 2.4 - Carbohydrates28
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Chapter 2414
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Chapter 2312
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Chapter 2.1 - Atoms, Molecules, Ions, and Bonds19
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Chapter 2.2 - Properties of Water29
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Chapter 2.3 - Organic Molecules18
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Unit 4 - Evolution30
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Chapter 1/254
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Chapter 342
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Chapter 563
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Chapter 756
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Chapter 858
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Chapter 937
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Chapter 1125
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Chapter 4532
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Chapter 1320
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Chapter 1234
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Chapter 38.129
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Chapter 14/1530
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Chapter 1747
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Chapter 1614
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Chapter 1930
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Chapter 1822
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Chapter 2215
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Chapter 27.1 - 27.231
