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Discover Biology, 4th Full Edition | StudySpace

Biology in the News

Unit 1
- 1
- 2
- 3
- Interlude A
  - Organize
    - Study Plan
    - Flash Cards
  - Learn
  - Connect
    - Biology in the News
Unit 2
- 4
- 5
- 6
- 7
- 8
- 9
- Interlude B
  - Organize
    - Study Plan
    - Flash Cards
  - Learn
  - Connect
    - Biology in the News
Unit 3
- 10
- 11
- 12
- 13
- 14
- 15
- Interlude C
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    - Study Plan
    - Flash Cards
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  - Connect
    - Biology in the News
Unit 4
- 16
- 17
- 18
- 19
- Interlude D
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    - Biology in the News
Unit 5
- 20
- 21
- 22
- 23
- 24
- 25
- 26
- 27
- 28
- 29
- 30
- Interlude E
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    - Study Plan
    - Flash Cards
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  - Connect
    - Biology in the News
Unit 6
- 31
- 32
- Interlude F
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    - Flash Cards
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  - Connect
    - Biology in the News
Unit 7
- 33
- 34
- 35
- 36
- 37
- 38
- Interlude G
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    - Study Plan
    - Flash Cards
  - Learn
  - Connect
    - Biology in the News

Chapter 18

Chapter 18: Adaptation and Speciation

What's News Quizzes

Please read this article, Seeing Red and Blue Can Divide a Species—of Fish , and answer the following questions.

1. Why do females at deeper depths of Lake Victoria select red males more readily?

a) The temperature decrease at lower depths favors red males.
b) Evolution in genes favors visual perception of the red males.
c) Blue fish swim slower because of their darker color.
d) None of the above.

2. What causes the difference in the amount of red and blue light at different levels of Lake Victoria?

a) Organic substances in the water filter out blue light at deeper depths.
b) The plants keep the blue light from reflecting under water.
c) Red light is warmer, resulting in a higher water temperature and more light.
d) All of the above

3. Which of the following must be true for light color to be a selecting factor in evolutionary change?

a) Light color perception must be linked to genes.
b) Light color and water temperature must be linked.
c) Blue and red light must be converted to green light in the water.
d) Fish must be blind at greater depths of the lake.

4. What would be the expected evolution of the cichlid fish if the water conditions of Lake Victoria changed so that no color filtration of light took place?

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