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How do new species arise? Speciation

How do new species arise? Speciation . What is a species? A group of organisms that can breed with one another to produce fertile offspring. Species share the same gene pool. Question: How to classify a mule?. Kingdom: Animalia Phylum: Chordata Class : Mammalia

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How do new species arise? Speciation

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  1. How do new species arise? Speciation

  2. What is a species? A group of organisms that can breed with one another to produce fertile offspring. Species share the same gene pool. Question: How to classify a mule?

  3. Kingdom: Animalia Phylum:Chordata Class: Mammalia Order:Perissodactyla Family:Equidae Genus:Equus Species: Equus asinus x Equus caballus

  4. How do new species arise? • Isolation! • The gene pools of two populations • must become reproductively isolated • for them to become new species. • Question: How can populations • become isolated?

  5. Behavioral Isolation Occurs when two populations can interbreed, but have differences in courtship or other reproductive strategies that involve behavior. Example: eastern & western winter wrens

  6. Geographic Isolation Two populations are separated by geographic barriers such as rivers, mountains, or bodies of water. Example: Abert & Kaibab squirrels

  7. Temporal Isolation When species reproduce at different times. Examples: Plants with different flowering seasons. Fireflies that mate at different times of the night.

  8. Case Study: The Galapagos Finches! ~Please turn to page 408 in the book~

  9. How are species eliminated? Extinction

  10. Extinction: Extinction occurs when a species disappears from its range. A species whose population size is declining in a way that places it in danger of extinction= endangered.

  11. More than 99% of all species that have ever been alive on earth are now extinct.

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