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Please explain In a Drosophila dihybrid cross, a sepia male was mated to a apterous female.
Their phenotypically wild F_1 female produced the following offspring when crossed to
phenotypically wild F_1 males: Please set up a null hypothesis and use a Chi-square analysis to
see if the observation follows the Mendelian phenotypic ratio.
Solution
Answer:
Chi-Square value= 1.33
The degrees of freedom = 4-1 = 3
The probability level for df 3
Chi-Square value, 1.33 lies below 0.5 (probability), so we fail to reject null
hypothesis.PhenotypeObserved(O)Expected (E)O-E(O-E)2(O-E)2/EWild
type45045000.000.00Sepia16015010100.000.67Apterous140150-
10100.000.67sepia/aprerous505000.000.008008001.33

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