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Dark brown coloration arises Starting population has mostly light wings. by a new mutation that creates a dark allele. Dark brown wings make the butterflies less susceptible to predation. The dark brown butterflies have a higher Darwinian fitness than do the light butterflies. Light wings Dark wings Many generations Population after directional This population has a higher mean fitness than the starting population because the darker butterflies are less susceptible to predation and therefore are more likely to survive and reproduce. selection has mostly dark wings. Light wings Dark wings (a) An example of directional selection (b) Graphlcal representatlon of directional selection Number of individuals Number of individuals

Dark brown coloration arises Starting population has mostly light wings. by a new mutation that creates a dark allele. Dark brown wings make the butterflies less susceptible to predation. The dark brown butterflies have a higher Darwinian fitness than do the light butterflies. Light wings Dark wings Many generations Population after directional This population has a higher mean fitness than the starting population because the darker butterflies are less susceptible to predation and therefore are more likely to survive and reproduce. selection has mostly dark wings. Light wings Dark wings (a) An example of directional selection (b) Graphlcal representatlon of directional selection Number of individuals Number of individuals

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
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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With respect to this form of natural selection, explain the meaning of the word directional.

Dark brown coloration arises Starting population has mostly light wings. by a new mutation that creates a dark allele. Dark brown wings make the butterflies less susceptible to predation. The dark brown butterflies have a higher Darwinian fitness than do the light butterflies. Light wings Dark wings Many generations Population after directional This population has a higher mean fitness than the starting population because the darker butterflies are less susceptible to predation and therefore are more likely to survive and reproduce. selection has mostly dark wings. Light wings Dark wings (a) An example of directional selection (b) Graphlcal representatlon of directional selection Number of individuals Number of individuals
Transcribed Image Text:Dark brown coloration arises Starting population has mostly light wings. by a new mutation that creates a dark allele. Dark brown wings make the butterflies less susceptible to predation. The dark brown butterflies have a higher Darwinian fitness than do the light butterflies. Light wings Dark wings Many generations Population after directional This population has a higher mean fitness than the starting population because the darker butterflies are less susceptible to predation and therefore are more likely to survive and reproduce. selection has mostly dark wings. Light wings Dark wings (a) An example of directional selection (b) Graphlcal representatlon of directional selection Number of individuals Number of individuals
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