Perform a chi-square test of independence on the data provided to determine if the genes for flower color and pollen shape in sweet peas are assorting independently. Give the chi-square value, degrees of freedom, and associated probability. What conclusion would you draw about the independent assortment of these genes? Hint: the expected phenotype ratios are 9:3:3:1 instead of 1:1:1:1 due to the type of cross that was performed.

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Author:Elaine N. Marieb, Katja N. Hoehn
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Perform a chi-square test of independence on the data provided to determine if the genes for flower color and pollen shape in sweet peas are assorting independently. Give the chi-square value, degrees of freedom, and associated probability. What conclusion would you draw about the independent assortment of these genes? Hint: the expected phenotype ratios are 9:3:3:1 instead of 1:1:1:1 due to the type of cross that was performed.
Experiment
Question: Do the genes for flower color and pollen shape
in sweet peas assort independently?
Methods Cross two strains homozygous for two
different traits.
P generation
Homozygous strains
Purple flowers,
long pollen
Red flowers,
round pollen
O Pollen
Fertilization
F, generation
Purple flowers,
long pollen
Self-fertilization
Results
F2 generation
284
21
21
55
Purple
flowers,
Purple
flowers,
long
pollen
Red
flowers,
Red
round
pollen
long
pollen
flowers,
round
pollen
Conclusion: F, progeny do not appear in the 9:3:3:1
ratio expected with independent assortment.
Pierce, Genetics:A Conceptual Approach, 7e © 2020
W. H. Freeman and Company
7.2 Nonindependent assortment of flower color and pollen shape in sweet peas.
Transcribed Image Text:Experiment Question: Do the genes for flower color and pollen shape in sweet peas assort independently? Methods Cross two strains homozygous for two different traits. P generation Homozygous strains Purple flowers, long pollen Red flowers, round pollen O Pollen Fertilization F, generation Purple flowers, long pollen Self-fertilization Results F2 generation 284 21 21 55 Purple flowers, Purple flowers, long pollen Red flowers, Red round pollen long pollen flowers, round pollen Conclusion: F, progeny do not appear in the 9:3:3:1 ratio expected with independent assortment. Pierce, Genetics:A Conceptual Approach, 7e © 2020 W. H. Freeman and Company 7.2 Nonindependent assortment of flower color and pollen shape in sweet peas.
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