Presentation on theme: "What Is a Species?. Activity 10: What Is a Species? LIMITED LICENSE TO MODIFY. These PowerPoint® slides may be modified only by teachers currently teaching."— Presentation transcript:
Activity 10: What Is a Species? LIMITED LICENSE TO MODIFY. These PowerPoint® slides may be modified only by teachers currently teaching the Science and Global Issues SEPUP course to customize the unit to match their students’ learning levels or to insert additional teaching aides. Modified slides may be used only by the modifying teacher in his or her classroom, or shared with other teachers of Science and Global Issues within the teacher’s school district, with these same restrictions. Modified slides may not be taken out of the classroom or distributed to any non-student person or organization. Except for use with students in the classroom, modified slides may not be published in printed or electronic form, including posting on the Internet. Only text may be modified: photographs and illustrations on the slides may not be modified in any way except to change their size. DISCLAIMER OF WARRANTY. THE REGENTS OF THE UNIVERSITY OF CALIFORNIA (“University”) MAKE NO REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. University will not be liable for any costs, damages, fees or other liability, nor for any direct, indirect, special, incidental or consequential damages (including lost profits) with respect to any claims by the purchaser or user of Science and Global Issues or any third party on account of or arising from the use or modifications to the slides. Client acknowledges and accepts that University services are provided on an as-is basis.
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?
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.
Activity 10: What Is a Species? How do new species separate from existing species? Challenge
Activity 10: What Is a Species? Procedure Species Separation Example number/organism name Claim Evidence to support the claim Reasoning
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
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:
ProcedureProcedure How did you classify the barriers to reproduction? What groupings did you decide on?
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
Activity 10: What Is a Species? Follow Up Explain how geographic isolation can lead to speciation. Analysis 2
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
Activity 10: What Is a Species? How do new species separate from existing species? Revisit the Challenge
Activity 10: What Is a Species? biological species biological species concept evidence gene flow gene pool species Key Vocabulary