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Speciation

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Page 1: Speciation. Biological Species Concept Population that can interbreed to produce viable and fertile offspring

Speciation

Page 2: Speciation. Biological Species Concept Population that can interbreed to produce viable and fertile offspring

Biological Species Concept

Population that can interbreed to produce viable and fertile offspring

Page 3: Speciation. Biological Species Concept Population that can interbreed to produce viable and fertile offspring

Eastern Meadowlark Western Meadowlark

Biological Species Concept

Cannot breed, different songs, different behaviors

Page 4: Speciation. Biological Species Concept Population that can interbreed to produce viable and fertile offspring

Speciation

Formation of a new species

Page 5: Speciation. Biological Species Concept Population that can interbreed to produce viable and fertile offspring

How does Speciation occur?

- Gene pools become separated- Populations become reproductively isolated

Reproductive Isolation

Biological barriers that prevent members from producing viable and fertile offspring

Page 6: Speciation. Biological Species Concept Population that can interbreed to produce viable and fertile offspring

Reproductive Isolation Pre-zygotic (before the zygote)

Page 7: Speciation. Biological Species Concept Population that can interbreed to produce viable and fertile offspring

Habitat Isolation

2 species, 2 different habitats within same area

Rarely cross paths

Page 8: Speciation. Biological Species Concept Population that can interbreed to produce viable and fertile offspring
Page 9: Speciation. Biological Species Concept Population that can interbreed to produce viable and fertile offspring

Temporal Isolation

Eastern Spotted Skunk

Western Spotted Skunk

Reproduce late winter

Reproduce late summer

Breed at different times(day/season/year)

Cannot mix gametes

Page 10: Speciation. Biological Species Concept Population that can interbreed to produce viable and fertile offspring

Behavioral Isolation

Courtship rituals that are uniqueto breeding success

Page 11: Speciation. Biological Species Concept Population that can interbreed to produce viable and fertile offspring
Page 12: Speciation. Biological Species Concept Population that can interbreed to produce viable and fertile offspring

Mechanical IsolationMorphological

differences that prevent mating

Page 13: Speciation. Biological Species Concept Population that can interbreed to produce viable and fertile offspring

Gametic Isolation

Purple Sea Urchin Red Sea Urchin

Sperm of #1 not able to fertilize egg of #2Sperm cannot survive, cannot penetrate egg

Page 14: Speciation. Biological Species Concept Population that can interbreed to produce viable and fertile offspring

Reproductive Isolation Post-zygotic (after the zygote)

Hybrid Equine

Page 15: Speciation. Biological Species Concept Population that can interbreed to produce viable and fertile offspring

Zebroid or Zorse - sterile

Viable (able to survive)Infertile (not able to reproduce)

Page 16: Speciation. Biological Species Concept Population that can interbreed to produce viable and fertile offspring

Zedonk, Zebrass - sterile

Page 17: Speciation. Biological Species Concept Population that can interbreed to produce viable and fertile offspring

Offspring = Mule = sterile

Horse

Donkey

Page 18: Speciation. Biological Species Concept Population that can interbreed to produce viable and fertile offspring

Offspring = Hinny = sterile

Horse


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