Name of Student:
Section:
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Name of Teacher:
Date Received:
Date Accomplished:
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Score:
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PRE-TEST
1. D
2. B
3. A
4. D
5. B
LOOKING BACK
Directions: Complete each sentence below, then fill in the table to show the difference between DNA and
mRNA.
 Guanine, cytosine, thymine, and 1. ADENINE are the four 2. NITROGEN BASES
 In DNA, guanine always forms hydrogen bonds with 3. CYTOSINE.
 The process of 4. REPLICATION produces a new copy of an organism’s genetic information, which is
passed on to a new cell.
 The double coiled, “staircase” shape of DNA is called a 5. DOUBLE HELIX.
DNA
Double Helix
Adenine, Thymine, Guanine, Cytosine
Deoxyribose
Nucleus
mRNA
SHAPE
NITROGEN BASES
SUGARS
LOCATION
Single Helix
Guanine, Cytosine, Adenine, Uracil
Ribose
Nucleus, Ribosomes
.
Activity 1: A horse is a horse!
Procedure:1. Examine the image below, then answer the questions that follow
Guide Questions:
1. Give two similarities between each of the skulls that might lead to the conclusion that these are all related
species. The skulls all have a similar ridge that protrudes from the top. The overall shape is the same.
Each skull has a set of flattened teeth.
2. What is the biggest change in skull anatomy that occurred from the dawn horse to the modern horse?
The biggest change in the skull is the size a showing us that horses came from a smaller specie of a
mammal before getting its size today.
3. What is the biggest change in leg anatomy that occurred from the dawn horse to the modern horse?
It’s feet it changed from having 4 toes to only having a singular big hoof.
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Activity 2: Embryos!
Directions: study the image of different embryos from early to late stage, then fill in the table below.
SPECIES
ANATOMICAL
CHANGES FROM EARLY
TO LATE STAGES
HUMAN
Developed limbs, Defined
features in face neck ear,
loss of tail, fingers are
present
Develops limbs, Tail
Shrinks, grows a large
head
CHICKEN
RABBIT
TORTOISE
SALAMANDER
FISH
Guide questions:
1. Describe the patterns you see. What physical similarities exist between each of the embryos?
2. Does this suggest an evolutionary relationship? Explain how these embryos can be used as evidence of a
common ancestor between each of these six organisms.
Activity 3: AHA! Analogous! Homologous!
Directions: Write in the space provided H if the structures below are homologous and A if they are analogous.
Activity from Payawal P. (1993)
Guide Questions:
1. Can you say that human, whale and bat might belong to a common ancestral group? Explain why.
2. Give other examples of homologous structures.
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REMEMBER
Fossils are a window into the past. They provide clear evidence that evolution has occurred. Scientists
who find and study fossils are called paleontologists.
Comparative anatomy is the study of the similarities and differences in the structures of different species.
Similar body parts may be homologous structures or analogous structures. Both provide evidence for
evolution.
Homologous structures are structures that are similar in related organisms because they were inherited
from a common ancestor. These structures may or may not have the same function in the descendants.
Analogous structures are structures that are similar in unrelated organisms. The structures are similar
because they evolved to do the same job, not because they were inherited from a common ancestor.
CHECKING YOUR UNDERSTANDING
Directions: Thoroughly answer the question using appropriate academic vocabulary and clear and complete
sentences.
Explain how a species can evolve through natural selection.
POST-TEST Directions: Write the letter of the
correct answer.
1. Where can most of the fossils be found?
a. Black soil
c. lava flows
b. Granite rock
d. sedimentary rock
2. Which pairs of animals show a correct example of homologous structures
a. Finger of human and arm of starfish
b. Flipper of whale and forelimb of cat
c. Tongue of frog and proboscis of mosquito
d. Wings of butterfly and bat
3. Evidence of evolution includes:
a. Anatomical evidence
b. DNA sequence analysis
c. Fossil record
d. All of the above
4. An example of a vestigial structure is the
a. Bird wings
b. Cat forelimb
c. Human tail bone
d. Kangaroo pouch
5. Which of the following statements DOES NOT describe evolution?
a. Evolution is continuous.
b. Evolution refers to change.
c. If there is mutation, there is evolution.
d. The world is stable and unchanging.
REFERENCES
https://opentextbc.ca/conceptsofbiologyopenstax/chapter/evidence-of-evolution/
http://biology.org.ua/files/lib/Raven_Johnson_McGraw-Hill_Biology.pdf
https://bio.libretexts.org/Bookshelves/Human_Biology/Book%3A_Human_Biology_(Wakim_and_Grewal)/0
9%3A_Biological_Evolution/9.3%3A_Evidence_for_Evolution
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