| Topics | Questions | Media Resources |
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12.1 The Concept of Evolution |
Describe the biological meaning of the word evolution.
Answer
| Quick Overview Key Points |
12.2 The Role of Natural Selection in Evolution | - Define natural selection.
Answer
What is fitness and how is it related to reproduction ?
Answer
| Quick Overview Key Points Animations and Review |
12.3 What Influences Natural
Selection? |
What factors can
contribute to diversity in the gene pool?
Answer
Why is over-reproduction
necessary for evolution?
Answer
Why is sexual
reproduction important to the process of natural selection?
Answer
How might a harmful
allele remain in a gene pool for generations without being eliminated by
natural selection?
Answer
| Quick Overview Key Points Interactive Concept Maps Experience This! |
12.4 Common Misunderstandings About Natural Selection | -
Why are acquired
characteristics of little interest to evolutionary biologists?
Answer
In what way are the phrases
‘survival of the fittest’ and ‘struggle for existence’ correct? In what
ways are they misleading?
Answer
| Quick Overview Key Points |
12.5 Processes that Drive Natural Selection |
A gene pool has equal
numbers of alleles B and b.
Half of the B alleles mutate to b alleles in the original
generation. What will the allele frequencies be in the next generation?
Answer
List three factors that can
lead to changed gene frequencies from one generation to the next.
Answer
Give two examples of
selecting agents and explain how they operate.
Answer
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Distinguish between stabilizing, directional, and disruptive selection.
Answer
| Quick Overview Key Points Animations and Review |
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12.6 Evolution without
Selection—Genetic Drift |
Why is genetic drift more likely in small populations ?
Answer
Give an example of genetic
drift.
Answer
| Quick Overview Key Points |
12.7 Gene-Frequency Studies and Hardy-Weinberg Equilibrium |
The Hardy-Weinberg
concept is only theoretical. What factors do not allow it to operate in a
natural gene pool?
Answer
The smaller the
population, the more likely it is that random changes will influence gene
frequencies. Why is this true?
Answer
| Quick Overview Key Points Interactive Concept Maps |
12.8 A Summary of the Causes of Evolutionary Change |
Why is each of the following important for
an understanding of evolution: mutation, migration, sexual
reproduction, selective agents, and population size?
Answer
| Quick Overview Key Points Food For Thought Interactive Concept Maps |
