Objective: to be able to explain how a species originates

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Presentation transcript:

Objective: to be able to explain how a species originates Speciation Objective: to be able to explain how a species originates

Speciation species- have the ability to interbreed speciation- how species originate reproductive isolation….is isolating mechanisms….is reproductive barriers….is

Reproductive barriers Prezygotic barrier before attempt to breed Postzygotic barrier after attempt to breed

Prezygotic Geographic live in different areas Habitat live in same area but different habitat ex: garter snakes-1 species in water, other on land

Prezygotic Temporal reproduce at different times of year or day ex: flowers that only open in morning, others at night Behavioral have different courtship rituals ex: Birds songs that are species specific

Prezygotic Mechanical physically can’t mate--- ex: plants use different pollinators “puzzle pieces” Gametic sperm can’t fertilize the egg ex: sea urchins release sperm and egg, can only fuse with their species

Postzygotic Reduced hybrid viability die early ex: salamander Reduced hybrid fertility can’t reproduce ex: mule Hybrid breakdown offspring can’t reproduce ex: rice