For each of the following situations, indicate if it is best explained by (A) directional selection; (B), stabilizing selection; or (C) disruptive selection. Put the correct letter (A, B, or C) in each box. a. A paleo-zoologist studying the fossils of a particular lineage of fish noticed a steady increase in the number of teeth over time; the oldest fossils had the fewest teeth, while more recent fossils had more teeth. Extant members of the same group had the most teeth. b. A population of poisonous frogs was examined. Researchers discovered that individual with lower poison levels were more likely to be preyed upon during their larval stage, while individuals with higher poison levels had decreased fertility. After measuring the poison concentrations of a large sample and graphing the results, they found most individuals were clustered around a fairly narrow band of values. c. A population of tropical fish is mostly composed of individuals with either bright yellow or bright red markings. The color is not related to sex. Very few fish in the population had intermediate, orange markings. d. The region downwind of a nickle smelter contains a population of ferns which are much more tolerant to metal pollutants in the soil than populations of the same species found in non-polluted areas.
For each of the following situations, indicate if it is best explained by (A) directional selection; (B), stabilizing selection; or (C) disruptive selection. Put the correct letter (A, B, or C) in each box. a. A paleo-zoologist studying the fossils of a particular lineage of fish noticed a steady increase in the number of teeth over time; the oldest fossils had the fewest teeth, while more recent fossils had more teeth. Extant members of the same group had the most teeth. b. A population of poisonous frogs was examined. Researchers discovered that individual with lower poison levels were more likely to be preyed upon during their larval stage, while individuals with higher poison levels had decreased fertility. After measuring the poison concentrations of a large sample and graphing the results, they found most individuals were clustered around a fairly narrow band of values. c. A population of tropical fish is mostly composed of individuals with either bright yellow or bright red markings. The color is not related to sex. Very few fish in the population had intermediate, orange markings. d. The region downwind of a nickle smelter contains a population of ferns which are much more tolerant to metal pollutants in the soil than populations of the same species found in non-polluted areas.
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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Transcribed Image Text:For each of the following situations, indicate if it is best explained by (A) directional selection; (B),
stabilizing selection; or (C) disruptive selection. Put the correct letter (A, B, or C) in each box.
a. A paleo-zoologist studying the fossils of a particular lineage of fish noticed a steady increase in
the number of teeth over time; the oldest fossils had the fewest teeth, while more recent fossils had
more teeth. Extant members of the same group had the most teeth.
b. A population of poisonous frogs was examined. Researchers discovered that individual with
lower poison levels were more likely to be preyed upon during their larval stage, while individuals
with higher poison levels had decreased fertility. After measuring the poison concentrations of a
large sample and graphing the results, they found most individuals were clustered around a fairly
narrow band of values.
c. A population of tropical fish is mostly composed of individuals with either bright yellow or bright
red markings. The color is not related to sex. Very few fish in the population had intermediate,
orange markings.
d. The region downwind of a nickle smelter contains a population of ferns which are much more
tolerant to metal pollutants in the soil than populations of the same species found in non-polluted
areas.
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