1. In a population of giraffes, the average length of the neck is under stabilizing selection. O True O False

Biology: The Dynamic Science (MindTap Course List)
4th Edition
ISBN:9781305389892
Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan
Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan
Chapter53: Population Interactions And Community Ecology
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Head in the Clouds
Giraffes are the tallest animals on land. An adult giraffe has a neck that exceeds 2 m in length.
This neck enables a giraffe to access food that other animals cannot reach and detect
predators from a long distance. Studies have shown that giraffes will browse trees at heights
that other herbivores cannot reach. The water and nutrients gained from leaves enhance a
giraffe's fitness by increasing survival and reproduction. However, a long neck comes with a
cost: the heart must spend more energy to pump blood to the brain. If a giraffe's neck were too
long, the energy required to circulate blood would exceed the energy gained from eating leaves.
1. In a population of giraffes, the average length of the neck is under stabilizing selection.
True
False
Transcribed Image Text:Head in the Clouds Giraffes are the tallest animals on land. An adult giraffe has a neck that exceeds 2 m in length. This neck enables a giraffe to access food that other animals cannot reach and detect predators from a long distance. Studies have shown that giraffes will browse trees at heights that other herbivores cannot reach. The water and nutrients gained from leaves enhance a giraffe's fitness by increasing survival and reproduction. However, a long neck comes with a cost: the heart must spend more energy to pump blood to the brain. If a giraffe's neck were too long, the energy required to circulate blood would exceed the energy gained from eating leaves. 1. In a population of giraffes, the average length of the neck is under stabilizing selection. True False
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