need help on 19 18. In much of the northern United States, the bracken fern, Pteridium aquilinum, grows in clones that arethe product of asexual reproduction and underground rhizome growth. A given clump of ferns, withseparate fronds, may be genetically identical (a clone) but could have different concentrations ofchemical defenses in their leaves. Natural selection on the concentration of chemical defenses infronds within a clonal clump of fronds (differences in herbivore damage to separate fronds) would:a) not be possible since the fronds are clonalb) not result in evolution of the chemical defensesc) cause a change in genotypes in a given cloned) yield evolution of improved chemical defenses19. The variation in concentrations of chemical defenses among individuals within a given clonedescribed in Question 18 (above) was caused by:a) different genotypesb) natural mistakesc) rare mutationsd) environmental factors

Answered: 19. The variation in concentrations of…

Applications and Investigations in Earth Science (9th Edition)

9th Edition

ISBN:9780134746241

Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa

Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa

Chapter1: The Study Of Minerals

Section: Chapter Questions

Problem 1LR

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need help on 19

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