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4/14 Daily Catalyst Pg. 47 DNA Similarities
 1. Why can bacteria evolve just like we can?
 2. How is comparative embryology evidence for Darwin’s Theory
of Evolution?
 3. True or false, Darwin’s theory of evolution included struggle for
existence, meaning some organisms contained beneficial
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variations and some1 did not.
 4. What type2of classification classifies organisms based on DNA
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similarities? 3
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4/14 Class Business Pg. 47 DNA Similarities
 Quiz #12 on Wednesday
 Evidence for Darwin’s Theory
 Evolution test on Thursday, April 16th
 Study guide due test day
 Review day on Wednesday, April 15th
 Quiz #12 on Review day
 Human body begins on Friday, April 17th
 Quiz Make up: Wyatt, Francisco and Avery
4/14 Agenda Pg. 47 DNA Similarities
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Daily Catalyst
Class Business
DNA similarities notes
Comparative embryology project
Exit Ticket #12
4/14 Daily Objective
 Explain how factors affect gene
frequency in a population over time and
the DNA similarities among organisms.
Darwin’s evidence Pg. 36
Fossils
Comparative
anatomy
Biogeography
Classification
DNA
Similarities
Includes comparative
embryology
Introduction
 Directions: Read textbook page. 262 section titled,
Molecular Biology
 Noise: 0 (SILENT)
 Time: 12 minutes
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Answer the following questions in your notebook on page 47.
1.Where does anatomical homology fail?
2.The greater the number of sequence differences, ___________
3. What is homology?
4. How does the concept of homology relate to molecular biology?
 Key Point #1: DNA is your genetic
information (genes)
 Your DNA determines the traits on the inside and the outside
 Genotypes Genes
 Phenotypes physical traits
 For example:
 predisposition to cancer or eye color
Turn and Talk
Do all cells contain the same DNA?
No, all cells have the same building blocks, but the
building blocks are arranged in different orders to
give us variety.
 Humans and Chimps share the same basic building
blocks like the nucleotides- A,T,G, and C
 Just arranged in different orders
Key Point #2:
The more DNA two organisms share
in common, the more closely related
they are.
Stop and Jot
 Why are homologous structures evidence for
evolution?
 Homologous structures are evidence that homologous
organisms share a common ancestor
Who do we get our DNA from?
If different organisms have similar DNA, then they…
Key Point #3: If two organisms have
homologous structures 
They SHARE A COMMON ANCESTOR!
For example…
 Humans share a large portion of their DNA with other
mammals. This strong correlation is evidence that
humans and other mammals are closely related.
What percentage of DNA does Mrs.
Ireland share with her siblings?
What percentage of DNA does Mrs.
Ireland share with other humans?
What percentage of DNA does Mrs.
Ireland share with other mammals?
What percentage of DNA does Mrs.
Ireland share with other organisms?
What percentage of DNA does Mrs.
Ireland share with plants?
Final thought- Turn and Talk
Why is DNA used as evidence for
evolution?
 DNA is a valid piece of evidence for evolution because we can use
DNA sequencing to determine similarities and differences between
species. DNA can also account for structural similarities seen in
organisms. For species that have a common ancestor and have
recently undergone evolution to form a new species, will share more
DNA with one another.
 1 minute break
 Find a classmate and find out what their favorite
Disney movie is. Be ready to share out!
Pg. 48 Gene Pool
What do you notice?
Gorilla
Humans
Chimp
Dog
Orangutan
Darwin believed in
evolution by natural
selection:
good traits
The gene pool
GENES present in a
 Key Point #1: All of the ___________
population.
 The more biodiverse a population is…
 The more genes in the gene pool!
Think back…
Over time, the gene pool changesKey Point #2: New genes are
introduced by:
Mutations in DNA
Adaptations
Adaptations
 A heritable trait that helps you
survive and reproduce.
Mutations
 A change in your DNA
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“Bad” genes disappear because:
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They do not increase chance of
survival.
What else could lead to the gene
pool changing?
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Predators
Prey
Resource changes
Disturbances
 Natural disasters
 Human activity
What do species do to survive?
 Changes in the gene pool will change gene frequencies.
 Key Point #3: Gene Frequency
 how often a certain gene appears.
 For example: In the artic, the gene frequency of the white fur is
more common for camouflage.
Key Point #4: Over time, the
gene frequency will change due
to predators, resources, and
environmental changes.
How you might be tested on this
Work Time
 Directions: On notebook page 48, answer the following
textbook questions:
 Page. 275:
 Questions: 3, 4, 7, and 15
 Noise: 1 (with partner)
 Time: 10 minutes
 On page 27 answer in your notes:
Exit Ticket #12 DNA
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 Name: _________ Date: 4/14 Period: 1 Score: ____/4
1. What is DNA?
2. If two organisms have little to no DNA similarities, what can we
say about their relation?
3. Why are homologous structures evidence for evolution?
4. Use the diagram to explain the similarity between Human and
Zebras.
Exit Ticket #12
 1. What is DNA?
 All of your genetic information (traits)
 2. If two organisms have little to no DNA similarities, what can we
say about their relation?
 They are not closely related to one another
 3. Why are homologous structures evidence for evolution?
 The structures are similar because they share DNA from a common
ancestor and used for a different purpose due to a different
environment.
 4. Use the diagram to explain the similarity between Human and
Zebras.
 They are not related to one another and only have one amino acid in
common.