Download 5.1 Natural Selection Next To 57

Evolution: Chapter 5 Lesson 1
Modified from L. Gilmore 2013
5.1 Natural Selection
Vocabulary
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• Evolution is change over time.
• The naturalist Charles Darwin was the first
person to write a thorough collection of
evidence supporting evolution.
• Species a group of organisms that share
traits AND can reproduce a fertile
offspring.
5.1 Natural Selection
Darwin’s Claims
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• Darwin made OBSERVATIONS about the
diversity and uniqueness of organisms.
• He then made CLAIMS about the process
responsible for this diversity.
• Darwin used all his years of observations as
EVIDENCE to support these claims.
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Voyage of the Beagle
• Look at Figure 2 on pg 211.
• Where did the HMS Beagle stop before
reaching the Galapagos Islands?
• Multiple locations on South America
Fun Fact: The entire voyage took 5 years
5.1 Natural Selection
Voyage of the Beagle
5.1 Natural Selection
Tortoises
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• Darwin found giant tortoises on all the
Galapagos Islands, but nowhere else.
• He wondered why they were so different
even though they lived on islands only
about 50 miles apart.
• He reasoned that each new population
changed slightly, or evolved, to fit its
unique environment on the island.
5.1 Natural Selection
Tortoises
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• Read the first two paragraphs on pg 212.
What is unique about these tortoises?
Dome-shaped
Saddle-shaped
5.1 Natural Selection
LEFT- Tortoises
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• Read the first two paragraphs on pg 212.
What is unique about these tortoises?
Dome-shaped
Saddle-shaped
Short necks
Long necks
Eat low growing plants
Eat high growing cactus.
5.1 Natural Selection
Tortoises
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• Why might one tortoise population evolve
long necks?
• Share with your partner.
- Species
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– Western spotted skunk,
– mountain lions
– great white sharks
– With your partner think of four other
species, and write them down.
5.1 Natural Selection
Vocabulary
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• Selective breeding is breeding plants
and animals to get offspring with
desired characteristics based on
HUMAN needs only.
Not a Species
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– A mule is the offspring of a male donkey
and a female horse. Horses and
donkeys are different species, with
different numbers of chromosomes.
– A liger is the offspring of a male lion and
a female tiger.
These are both examples of selective
breeding, even if accidental.
Liger in
action
Not a Species
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•Summarize what you learned about ligers!
•3-5 sentences!
•Now summarize what you learned today
•5-8 sentences!