1.what is indicated when species have similar traits -...
TRANSCRIPT
Grab Warm-up # 9 by the door1. 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?
• Homologous
• Divergent evolution: closely related species evolving different characteristics (Away from each other)
• Analogous
• Convergent evolution: similar characteristics developing in unrelated species
Evidence for Evolution
• Fossils
• Biogeography
• Embryology
• Homologous structures
• Analogous structures
• Vestigial structures
• Gene comparisons
• Protein comparisons
Evidence for Evolution
• The following are pictures of types of evidence for evolution
• Be prepared to be called on to give the type of evidence shown
Picture Quiz
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)
• Homologous
• Divergent evolution: closely related species evolving different characteristics (Away from each other)
• Analogous
• Convergent evolution: similar characteristics developing in distantly related species
Evidence for Evolution
• Today you are going to demonstrate your understanding of the use of evidence to support evolution through a lab exercise
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
Cetacean Evolution Lab
• Read the lab introductionThere 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.
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
Cetacean Evolution Lab
• Data:
Cetacean Evolution Lab
Station Number Type of Evidence
Quantitative Data
(If available, use
units)
Qualitative Data
(If available, be
specific)
1
2
3
4
5
6
7
8
• 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.
Cetacean Evolution Lab