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Classify examples of evolution or phenotypic plasticity. Evolution Phenotypic plasticity The leaves growing at the top of a tree are smaller than those growing The coat color of a snowshoe hare lightens with shortening periods of lower on the tree. light exposure. A species of trees in a forest has both large and small leaves, but over generations trees with larger leaves begin to become more abundant. Snowshoe hares that do not molt before first snowfall are more easily spotted by predators, causing the population to begin to molt earlier each season. A human community living at a high altitude begins to show a narrower range of red blood cell counts over generations, even when individuals A man moving from a low to a high altitude undergoes an increase in move to another elevation. red blood cell count. Answer Bank Incorrect

Classify examples of evolution or phenotypic plasticity. Evolution Phenotypic plasticity The leaves growing at the top of a tree are smaller than those growing The coat color of a snowshoe hare lightens with shortening periods of lower on the tree. light exposure. A species of trees in a forest has both large and small leaves, but over generations trees with larger leaves begin to become more abundant. Snowshoe hares that do not molt before first snowfall are more easily spotted by predators, causing the population to begin to molt earlier each season. A human community living at a high altitude begins to show a narrower range of red blood cell counts over generations, even when individuals A man moving from a low to a high altitude undergoes an increase in move to another elevation. red blood cell count. Answer Bank Incorrect

Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
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Classify examples of evolution or phenotypic plasticity. Evolution Phenotypic plasticity The leaves growing at the top of a tree are smaller than those growing The coat color of a snowshoe hare lightens with shortening periods of lower on the tree. light exposure. A species of trees in a forest has both large and small leaves, but over generations trees with larger leaves begin to become more abundant. Snowshoe hares that do not molt before first snowfall are more easily spotted by predators, causing the population to begin to molt earlier each season. A human community living at a high altitude begins to show a narrower range of red blood cell counts over generations, even when individuals A man moving from a low to a high altitude undergoes an increase in move to another elevation. red blood cell count. Answer Bank Incorrect
Transcribed Image Text:Classify examples of evolution or phenotypic plasticity. Evolution Phenotypic plasticity The leaves growing at the top of a tree are smaller than those growing The coat color of a snowshoe hare lightens with shortening periods of lower on the tree. light exposure. A species of trees in a forest has both large and small leaves, but over generations trees with larger leaves begin to become more abundant. Snowshoe hares that do not molt before first snowfall are more easily spotted by predators, causing the population to begin to molt earlier each season. A human community living at a high altitude begins to show a narrower range of red blood cell counts over generations, even when individuals A man moving from a low to a high altitude undergoes an increase in move to another elevation. red blood cell count. Answer Bank Incorrect
Suppose scientists studied a species of plant that grows in shady environments. They measured the size of leaves in two plant populations and found that the size distribution was similar. In addition, they found that plants with larger leaves tended to produce more seeds and that their offspring tended to have large leaves. The scientists also measured the selection differential, S, of leaf size in each population. In population A, S equalled 1 cm². In population B, S equalled 2 cm?. Assume that the heritability of leaf size in the two populations is the same. Predict how the difference in S between the populations will affect the evolution of leaf size in these populations. O After a given number of generations, the leaves in population B will be larger than those in A. Because S indicates variance in leaf size, leaf size will evolve more rapidly in population B than in A. Environment plays a larger role in determining leaf size in population B than in population A. Because S represents positive selection pressure, leaf size will evolve more slowly in population A. Because S is larger in population B, leaf size will evolve more rapidly in population B than in A. O O O D O
Transcribed Image Text:Suppose scientists studied a species of plant that grows in shady environments. They measured the size of leaves in two plant populations and found that the size distribution was similar. In addition, they found that plants with larger leaves tended to produce more seeds and that their offspring tended to have large leaves. The scientists also measured the selection differential, S, of leaf size in each population. In population A, S equalled 1 cm². In population B, S equalled 2 cm?. Assume that the heritability of leaf size in the two populations is the same. Predict how the difference in S between the populations will affect the evolution of leaf size in these populations. O After a given number of generations, the leaves in population B will be larger than those in A. Because S indicates variance in leaf size, leaf size will evolve more rapidly in population B than in A. Environment plays a larger role in determining leaf size in population B than in population A. Because S represents positive selection pressure, leaf size will evolve more slowly in population A. Because S is larger in population B, leaf size will evolve more rapidly in population B than in A. O O O D O
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