1. Why can bacteria evolve just like we can? 2. How is
comparative embryology evidence for Darwins Theory of Evolution? 3.
True or false, Darwins theory of evolution included struggle for
existence, meaning some organisms contained beneficial variations
and some did not. 4. What type of classification classifies
organisms based on DNA similarities? 4/14 Daily Catalyst Pg. 47 DNA
Similarities 123123 12341234
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Quiz #12 on Wednesday Evidence for Darwins Theory Evolution
test on Thursday, April 16 th Study guide due test day Review day
on Wednesday, April 15 th Quiz #12 on Review day Human body begins
on Friday, April 17 th Quiz Make up: Wyatt, Francisco and Avery
4/14 Class Business Pg. 47 DNA Similarities
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Daily Catalyst Class Business DNA similarities notes
Comparative embryology project Exit Ticket #12 4/14 Agenda Pg. 47
DNA Similarities
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Explain how factors affect gene frequency in a population over
time and the DNA similarities among organisms. 4/14 Daily
Objective
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Darwins evidence Pg. 36 Fossils Comparative anatomy
Biogeography DNA Similarities Classification Includes comparative
embryology
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Directions: Read textbook page. 262 section titled, Molecular
Biology Noise: 0 (SILENT) Time: 12 minutes 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? Introduction
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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
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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. Turn and Talk
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Humans and Chimps share the same basic building blocks like the
nucleotides- A,T,G, and C Just arranged in different orders
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Key Point #2: The more DNA two organisms share in common, the
more closely related they are.
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Why are homologous structures evidence for evolution?
Homologous structures are evidence that homologous organisms share
a common ancestor Stop and Jot
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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!
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Humans share a large portion of their DNA with other mammals.
This strong correlation is evidence that humans and other mammals
are closely related. For example
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What percentage of DNA does Mrs. Ireland share with her
siblings? 99.9%
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What percentage of DNA does Mrs. Ireland share with other
humans? 98%
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What percentage of DNA does Mrs. Ireland share with other
mammals? 87%
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What percentage of DNA does Mrs. Ireland share with other
organisms? 81%
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What percentage of DNA does Mrs. Ireland share with plants?
30%
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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. Final thought- Turn and Talk
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1 minute break Find a classmate and find out what their
favorite Disney movie is. Be ready to share out!
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Pg. 48 Gene Pool
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What do you notice? Humans Dog Chimp Orangutan Gorilla
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Darwin believed in evolution by natural selection: good
traits
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Key Point #1: All of the ___________ present in a population.
The more biodiverse a population is The more genes in the gene
pool! The gene pool GENES
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Think back
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Over time, the gene pool changes- Key Point #2: New genes are
introduced by: Mutations in DNA Adaptations
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Adaptations A heritable trait that helps you survive and
reproduce. Mutations A change in your DNA
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Bad genes disappear because: They do not increase chance of
survival.
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Predators Prey Resource changes Disturbances Natural disasters
Human activity What else could lead to the gene pool changing?
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What do species do to survive?
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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.
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KK ey Point #4: Over time, the gene frequency will change due
to predators, resources, and environmental changes.
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How you might be tested on this
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Slide 35
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: Work
Time
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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 DNA
Slide 37
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. Exit Ticket #12