1. What Is a Species?

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3. Activity 10: What Is a Species? Get Started Write the questions below and your answers in your science notebook.  a. What is a species?  b. Some examples of species are: _______________________________.  c. How do biologists decide if two populations are of the same or different species?

4. Activity 10: What Is a Species? Introduction  The biological species concept is a method of defining a species based on whether the organisms actually or can potentially breed with each other to produce fertile offspring. Read the introduction.

5. Activity 10: What Is a Species?  How do new species separate from existing species? Challenge

6. Activity 10: What Is a Species? Procedure Species Separation Example number/organism name Claim Evidence to support the claim Reasoning

7. Activity 10: What Is a Species? Procedure Scientific Argumentation  A claim: your conclusion about the most logical placement of A and D on the tree  Evidence: the evidence you gathered that supports the claim  Reasoning: how the evidence you gathered supports the claim

8. Activity 10: What Is a Species? Procedure  Early means they are either still one species, or that they have just begun separation.  Mid means they are separating.  Late means they are at the end of separation, and they have most likely split into two species. Placement of species in the process of separation is as follows:

9. Activity 10: What Is a Species? Procedure

10. ProcedureProcedure  How did you classify the barriers to reproduction?  What groupings did you decide on?

11. Activity 10: What Is a Species? Procedure  Find a partner from another group and discuss your definitions for the types of barriers. Give an example or two for each.  Ask each other questions.  Be prepared to share your ideas. Informal Meeting of the Minds

12. Activity 10: What Is a Species? Follow Up  Explain how geographic isolation can lead to speciation. Analysis 2

13. Activity 10: What Is a Species?  Lions and tigers do not overlap in range and do not breed in nature. In captivity, a male lion may mate with a female tiger and produce offspring. Although more rare, a male tiger may also mate with a female lion to produce offspring. In both cases, the male offspring are sterile, while the females might or might not be fertile. Explain where lions and tigers are on the speciation continuum, according to the biological species concept. Support your answer with evidence and reasoning. Analysis 3

14. Activity 10: What Is a Species?  How do new species separate from existing species? Revisit the Challenge

15. Activity 10: What Is a Species?  biological species  biological species concept  evidence  gene flow  gene pool  species Key Vocabulary