macroevolution - speciation
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MACROEVOLUTION - SpeciationThe evolution of a new, separate species
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BioH Ch 17
Considerations
2
Reproductive Isolation Mechanisms
Pre ZygoticBehavioral
Temporal
Mechanical3
Ecological
Gametic mortality
Habitat (most common)
More Pre-Zygotic Reproductive Isolation Mechanisms
4
Post-Zygotic Isolation Mechanisms
Hybrid viability – embryonic premature death
Hybrid infertility
5
Allopatric Speciation
Geographic barriers
6
Sympatric Speciation
Species form within a population home range -no physical barriers
7
Parapatric Speciation
Neighboring populations give rise to new species
X
Hybrid
Bullock’s OrioleBaltimore Oriole
8
m. domesticus
m. musculus
9
Speciation PatternsCladogenesis – branching
lineage
Anagenesis – unbranching descent
10
Exercise
11
Patterns of Speciation
12
Adaptive Radiation
Adaptive Zones 13
14
Extinction
15
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