Notes speciation

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Notes speciation

  1. 1. Notes: Speciation (pg 12)• What is a species?
  2. 2. Notes: Speciation (pg 12)• What is a species?• Biological species concept = a species is agroup of organisms that can interbreed andproduce fertile offspring
  3. 3. Notes: Speciation (pg 12)• What is a species?• Biological species concept = a species is agroup of organisms that can interbreed andproduce fertile offspring• Speciation = the origin of new species inevolution
  4. 4. Types of Speciation1. Allopatric speciation: occurs when apopulation becomes segregated by ageographic barrier (mountain, river, etc.)
  5. 5. Types of Speciation1. Allopatric speciation: occurs when a populationbecomes segregated by a geographic barrier(mountain, river, etc.)Example: Squirrels in Arizona: were one species untilthe grand canyon formed. Squirrels on the southrim were isolated from those on the north rim.Each population changed due to genetic drift andnatural selection. Now if brought together they arenot able to interbreed.
  6. 6. 2. Sympatric speciation: occurs withoutgeographic barriers
  7. 7. 2. Sympatric speciation: occurs withoutgeographic barriers• Habitat isolation: species live in the samearea, but in different habitats so they rarelyencounter one another
  8. 8. 2. Sympatric speciation: occurs withoutgeographic barriers• Habitat isolation: species live in the samearea, but in different habitats so they rarelyencounter one another• Behavioral isolation: species have differentsignals to attract mates
  9. 9. 2. Sympatric speciation: occurs withoutgeographic barriers• Habitat isolation: species live in the samearea, but in different habitats so they rarelyencounter one another• Behavioral isolation: species have differentsignals to attract mates• Temporal isolation: species breed duringdifferent times of day or different seasons
  10. 10. 2. Sympatric speciation: occurs without geographicbarriers• Habitat isolation: species live in the same area,but in different habitats so they rarely encounterone another• Behavioral isolation: species have differentsignals to attract mates• Temporal isolation: species breed during differenttimes of day or different seasons• Polyploidy: Due to a mistake during meiosis, anindividual ends up with more than 2 copies ofeach chromosome, so it can’t mate with parentpopulation. Common in plants.
  11. 11. Speciation SkitsWorking in groups, you will make up a skit aboutone type of speciation (chooseallopatric, habitat isolation, behavioralisolation, temporal isolation, or polyploidy)• Skits should be 1-2 minutes long• Must have a written script. Write it on page 13• All group members must have a speaking role

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