Applications and Investigations in Earth Science (9th Edition)
Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN: 9780134746241
Author: Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher: PEARSON
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18. In much of the northern United States, the bracken fern, Pteridium aquilinum, grows in clones that are the product of asexual reproduction and underground rhizome growth. A given clump of ferns, with separate fronds, may be genetically identical (a clone) but could have different concentrations of chemical defenses in their leaves. Natural selection on the concentration of chemical defenses in fronds within a clonal clump of fronds (differences in herbivore damage to separate fronds) would: a) not be possible since the fronds are clonal b) not result in evolution of the chemical defenses c) cause a change in genotypes in a given clone d) yield evolution of improved chemical defenses 19. The variation in concentrations of chemical defenses among individuals within a given clone described in Question 18 (above) was caused by: a) different genotypes b) natural mistakes c) rare mutations d) environmental factors
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Transcribed Image Text:18. In much of the northern United States, the bracken fern, Pteridium aquilinum, grows in clones that are the product of asexual reproduction and underground rhizome growth. A given clump of ferns, with separate fronds, may be genetically identical (a clone) but could have different concentrations of chemical defenses in their leaves. Natural selection on the concentration of chemical defenses in fronds within a clonal clump of fronds (differences in herbivore damage to separate fronds) would: a) not be possible since the fronds are clonal b) not result in evolution of the chemical defenses c) cause a change in genotypes in a given clone d) yield evolution of improved chemical defenses 19. The variation in concentrations of chemical defenses among individuals within a given clone described in Question 18 (above) was caused by: a) different genotypes b) natural mistakes c) rare mutations d) environmental factors
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Experiments within clones have shown that tree resistance is partly determined by genetically controlled host tree characteristics and identifying resistant trees and selecting genotypes that are more resistant to multiple pests are of great importance for chemical defenses

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