Part 1: Null hypothesis: Segregation of two alleles in one locus is observed.
Expected Phenotypic Ratio: 1:2:1
Total number of offsprings = 100 flowers
Expected blue-flowered plants = = 50 flowers
Expected purple-flowered plants = = 25 flowers
Expected white-flowered plants = = 30 flowers
Dr. Ara B. Dopsis and Dr. C. Ellie Gans are performing genetic crosses on daisy plants. They self-fertilize a blue-flowered daisy and grow 100 progeny plants that consist of 55 blue-flowered plants, 22 purple-flowered plants, and 23 white-flowered plants.
Dr. Dopsis believes this is the result of segregation of two alleles at one locus and that the progeny ratio is 1:2:1. Dr. Gans thinks the progeny phenotypes are the result of two epistatic genes and that the ratio is 9:3:4.
The two scientists ask you to resolve their conflict by performing chi-square analysis on the data for both proposed genetic mechanisms:
1) Calculate the chi-square value for hypothesis of segregation of two alleles at one locus.
2) Calculate the chi-square value for hypothesis of interaction of two epistatic genes.
3) Based on chi-square analysis, what is your conclusion regarding these two genetic hypotheses?
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