Evolution! Concept 1: Analyzing the modes of speciation

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Transcript Evolution! Concept 1: Analyzing the modes of speciation

EVOLUTION!
CONCEPT 1: ANALYZING THE MODES
OF SPECIATION (MACROEVOLUTION)
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Chapter 24 (The Origin of Species)
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P. 159-160 in Holtzclaw
WHAT IS A ‘SPECIES’? JIGSAW DEBATE
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On your own:
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Meet with those that have the same concept as
you:
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Determine the pros and cons of your particular species
concept. Do you agree? What are some examples in
nature? Is this a practical means of identifying species?
Compare notes. Get argument ready.
Get together with those with the same number:
Share and solidify the pros and cons, examples, and
practicality of each species concept.
 Determine which species concepts your group agrees with
most.
- Which is the most practical?
- Which explains the origin of species best?
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Share with class!
CONCEPT 1 - SPECIATION
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The difference between microevolution and
macroevolution
The biological concept of species
Prezygotic and postzygotic barriers that maintain
reproductive isolation in natural populations
How allopatric and sympatric speciation are
similar and different
How an autopolyploid or an allopolyploid
chromosomal change can lead to sympatric speciation
How punctuated equilibrium and gradualism
describe two different tempos of speciation
THE ORIGIN OF SPECIES
– CHARLES DARWIN
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On the last page…
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“Thus, from the war of nature, from
famine and death, the most exalted
object which we are capable of
conceiving, namely, the production
of the higher animals, directly
follows. There is grandeur in this
view of life, with its several powers,
having been originally breathed by the
Creator into a few forms or into
one; and that whilst this planet has
gone cycling on according to the fixed
law of gravity, from so simple a
beginning endless forms most
beautiful and most wonderful have
been, and are being evolved.”
NOW…
Activity 24.1 – What factors affect speciation?
 Case Study!
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