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1. The following table gives data for the frequency of genotypes in a population of sunflower plants from a coastal sage scrub community over the course of 50 generations. Gene products of the A allele produce stems without hairs, while gene products of the a allele produce stems with short hairs but flowers with many infertile stamens, and the a' allele produces stems with dense hairs and flowers with all fertile stamens. Note that it may cost the plants greatly in extra carbon to produce these hairs. At the onset of this survey, an invasive insect species that feeds upon the buds of sunflowers had been accidentally introduced into the habitat of this plant population. This insect makes its living by ascending the stems of herbaceous plants rather than landing upon the flower stalks or stems. Thus, dense hairs would impede the ability of this insect to reach the buds. Interpret the results of the data and explain how natural selection might be driving the genotype frequencies in this sunflower population. What might you hypothesize about the adaptive trade-offs of these traits? Provide a graph of the data (hint: genotype frequency is the dependent variable and the individual genotypes are factors). Genotype AA Aa aa Aa' aa' a'a' Generation 1 0.302 0.167 0.091 0.134 0.124 0.182 Generation 10 0.225 0.126 0.053 0.184 0.160 0.252 Generation 25 0.184 0.089 0.044 0.196 0.180 0.307 Generation 50 0.140 0.071 0.026 0.216 0.204 0.367

1. The following table gives data for the frequency of genotypes in a population of sunflower plants from a coastal sage scrub community over the course of 50 generations. Gene products of the A allele produce stems without hairs, while gene products of the a allele produce stems with short hairs but flowers with many infertile stamens, and the a' allele produces stems with dense hairs and flowers with all fertile stamens. Note that it may cost the plants greatly in extra carbon to produce these hairs. At the onset of this survey, an invasive insect species that feeds upon the buds of sunflowers had been accidentally introduced into the habitat of this plant population. This insect makes its living by ascending the stems of herbaceous plants rather than landing upon the flower stalks or stems. Thus, dense hairs would impede the ability of this insect to reach the buds. Interpret the results of the data and explain how natural selection might be driving the genotype frequencies in this sunflower population. What might you hypothesize about the adaptive trade-offs of these traits? Provide a graph of the data (hint: genotype frequency is the dependent variable and the individual genotypes are factors). Genotype AA Aa aa Aa' aa' a'a' Generation 1 0.302 0.167 0.091 0.134 0.124 0.182 Generation 10 0.225 0.126 0.053 0.184 0.160 0.252 Generation 25 0.184 0.089 0.044 0.196 0.180 0.307 Generation 50 0.140 0.071 0.026 0.216 0.204 0.367

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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1. The following table gives data for the frequency of genotypes in a population of sunflower plants from a coastal sage scrub community over the course of 50 generations. Gene products of the A allele produce stems without hairs, while gene products of the a allele produce stems with short hairs but flowers with many infertile stamens, and the a' allele produces stems with dense hairs and flowers with all fertile stamens. Note that it may cost the plants greatly in extra carbon to produce these hairs. At the onset of this survey, an invasive insect species that feeds upon the buds of sunflowers had been accidentally introduced into the habitat of this plant population. This insect makes its living by ascending the stems of herbaceous plants rather than landing upon the flower stalks or stems. Thus, dense hairs would impede the ability of this insect to reach the buds. Interpret the results of the data and explain how natural selection might be driving the genotype frequencies in this sunflower population. What might you hypothesize about the adaptive trade-offs of these traits? Provide a graph of the data (hint: genotype frequency is the dependent variable and the individual genotypes are factors). Genotype AA Aa aa Aa' aa' a'a' Generation 1 0.302 0.167 0.091 0.134 0.124 0.182 Generation 10 0.225 0.126 0.053 0.184 0.160 0.252 Generation 25 0.184 0.089 0.044 0.196 0.180 0.307 Generation 50 0.140 0.071 0.026 0.216 0.204 0.367
Transcribed Image Text:1. The following table gives data for the frequency of genotypes in a population of sunflower plants from a coastal sage scrub community over the course of 50 generations. Gene products of the A allele produce stems without hairs, while gene products of the a allele produce stems with short hairs but flowers with many infertile stamens, and the a' allele produces stems with dense hairs and flowers with all fertile stamens. Note that it may cost the plants greatly in extra carbon to produce these hairs. At the onset of this survey, an invasive insect species that feeds upon the buds of sunflowers had been accidentally introduced into the habitat of this plant population. This insect makes its living by ascending the stems of herbaceous plants rather than landing upon the flower stalks or stems. Thus, dense hairs would impede the ability of this insect to reach the buds. Interpret the results of the data and explain how natural selection might be driving the genotype frequencies in this sunflower population. What might you hypothesize about the adaptive trade-offs of these traits? Provide a graph of the data (hint: genotype frequency is the dependent variable and the individual genotypes are factors). Genotype AA Aa aa Aa' aa' a'a' Generation 1 0.302 0.167 0.091 0.134 0.124 0.182 Generation 10 0.225 0.126 0.053 0.184 0.160 0.252 Generation 25 0.184 0.089 0.044 0.196 0.180 0.307 Generation 50 0.140 0.071 0.026 0.216 0.204 0.367
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