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How to do a Chi Square problem for my gentics class?

Dr. O. Sophila, a close friend of Dr. Ara B. Dopsis, reviews the F2 results Dr. Dopsis obtained in his experiment with iris plants described in Genetic Analysis 4.3. Dr. Sophila thinks the F2 progeny demonstrate that a single gene with incomplete dominance has produced a 1:2:1 ratio. Dr. Dopsis insists his proposal of recessive epistasis producing a 9:4:3 ratio in the F2 is correct. To test his proposal, Dr. Dopsis examines the F2 data under the assumptions of the single-gene incomplete dominance model using chi-square analysis.

1) find out this chi-square value.

 

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