In corn, purple kernels (P) are dominant over yellow kernels (p) and round kernels (R) are dominant to wrinkled kernels (r).    In a cross of PpRr (purple, round) with a pprr (yellow, wrinkled) plant, the following progeny were observed:   Phenotype Observed Expected (O-E) (O-E)2/E Purple, Round 117       Yellow, Round 126       Purple, Wrinkled 130       Yellow, Wrinkled 127         Total=500         Fill out the expected values in the chart above and calculate the Chi-Square value for your table, look up the p value associated with the Chi-Square.   How many degrees of freedom are there in the cross?   What is the Chi-Square value?   What is the p-value for this cross and what does your value mean? Explain the p-value clearly.

Human Biology (MindTap Course List)
11th Edition
ISBN:9781305112100
Author:Cecie Starr, Beverly McMillan
Publisher:Cecie Starr, Beverly McMillan
Chapter20: Chromosomes And Human Genetics
Section: Chapter Questions
Problem 7CT: The following pedigree shows the pattern of inheritance of red-green color blindness in a family....
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In corn, purple kernels (P) are dominant over yellow kernels (p) and round kernels (R) are dominant to wrinkled kernels (r). 

 

In a cross of PpRr (purple, round) with a pprr (yellow, wrinkled) plant, the following progeny were observed:

 

Phenotype

Observed

Expected

(O-E)

(O-E)2/E

Purple, Round

117

 

 

 

Yellow, Round

126

 

 

 

Purple, Wrinkled

130

 

 

 

Yellow, Wrinkled

127

 

 

 

 

Total=500

 

 

 

 

Fill out the expected values in the chart above and calculate the Chi-Square value for your table, look up the p value associated with the Chi-Square.

 

  1. How many degrees of freedom are there in the cross?

 

  1. What is the Chi-Square value?

 

  1. What is the p-value for this cross and what does your value mean? Explain the p-value clearly. 
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