Grab Warm-up # 9 by the door 1. What is indicated when species have similar traits (ie.

Transcription

1 Grab Warm-up # 9 by the door 1. What is indicated when species have similar traits (ie. embryos, genes, proteins)? 2. What is indicated when species are different, but perform the same function?

2 Evidence for Evolution Homologous Divergent evolution: closely related species evolving different characteristics (Away from each other) Analogous Convergent evolution: similar characteristics developing in unrelated species

3 Evidence for Evolution Fossils Biogeography Embryology Homologous structures Analogous structures Vestigial structures Gene comparisons Protein comparisons

4 Picture Quiz The following are pictures of types of evidence for evolution Be prepared to be called on to give the type of evidence shown

5 Picture Quiz

6 Picture Quiz

7 Picture Quiz

8 Picture Quiz

9 Picture Quiz

10 Picture Quiz

11 Picture Quiz

12 Picture Quiz

13 Picture Quiz

14 Picture Quiz

15 Picture Quiz

16 Picture Quiz

17 Evidence for Evolution Make a claim about the evolution of a specific characteristic in a species: Stating what kind of evidence is being used The specific traits of the evidence that are significant How those traits demonstrate the claim (specific part of a species evolution)

18 Evidence for Evolution Homologous Analogous

19 Evidence for Evolution Homologous Divergent evolution: closely related species evolving different characteristics (Away from each other) Analogous Convergent evolution: similar characteristics developing in distantly related species

20 Evidence for Evolution Get your packet out

21 Cetacean Evolution Lab Today you are going to demonstrate your understanding of the use of evidence to support evolution through a lab exercise

22 Cetacean Evolution Lab You will be making a claim about Cetacean evolution, observing evidence, and then using that evidence to support the claim that you made

23 Cetacean Evolution Lab Read the lab introduction There are 8 main categories of evidence for evolution; fossils, vestigial structures, homologous structures, analogous structures, biogeography, embryology, gene comparisons, and protein comparisons. This variety of evidence is used to support hypotheses about the evolution of various organisms. One group of organisms that have a particularly interesting evolutionary trajectory are Cetaceans, including whales, dolphins, and porpoises. Evidence suggests that mammals evolved on land; however Cetaceans are a group of water-dwelling mammals consisting of about 90 species of aquatic mammals. Scientists hypothesize that Cetaceans are a result of a land mammal evolving into an aquatic mammal. In this lab you will be presented with pieces of evidence for Cetacean evolution in all 8 categories. You will then use this evidence to support a claim about the evolution of aquatic mammals.

24 Cetacean Evolution Lab Take your time Be thorough; practice USING EVIDENCE to support claims

25 Cetacean Evolution Lab Pre-Lab: 1. What is a mammal? 2. What is a cetacean? 3. What are the 8 kinds of evidence for evolution? 4. Make a claim about the investigative question; in a COMPLETE SENTENCE state whether or not Cetaceans are descendent from land mammals. Copy data table, get checked off, start lab

26 Cetacean Evolution Lab Data: Station Number Type of Evidence Quantitative Data (If available, use units) Qualitative Data (If available, be specific)

27 Cetacean Evolution Lab Analysis: 1. What evidence could be used to support that Cetaceans are vertebrates (animals with spinal columns)? WHY? 2. What evidence could be used to support that Cetaceans are mammals? WHY? 3. Make a prediction about possible changes to Cetacean anatomy/physiology that could happen within the next millions of years. Use evidence to support your prediction. 4. Support your claim about Cetacean evolution from the pre-lab. Give TWO specific pieces of evidence, and explain what each piece of evidence suggests about Cetacean evolution.

28 Cetacean Evolution Analysis #4 1. Restate your claim 2. One piece of evidence 3. Support that claim with that evidence by: Giving the specific significant traits of the evidence How those traits demonstrate the claim 4. Repeat