In a Drosophila sex-linked cross, a wild type male was mated to a white eye fema

Question

In a Drosophila sex-linked cross, a wild type male was mated to a white eye female. Their phenotypically wild F female produced the following offspring when crossed to white eye males: Please set up a null hypothesis and use a chi-square analysis to see if the observation follows the phenotypic ratio. In a Drosophila dihybrid cross, a sepia male was mated to a apterous female. Their phenotypically wild F, female produced the following offspring when crossed to phenotypically wild F, males: Please set up a null hypothesis and use a Chi-square analysis to see if the observation follow the Mendelian phenotypic ratio.

Explanation / Answer

Answer:

Number of classes = 4

df= n -1 = 4-1 = 3

Chi square value = 1.5625, df = 3, Probabilty = 0.6679
The probability value is greater than the 0.05 critical value. Since this value is greater than the 0.05 critical value, therefore we reject the hypothesis.

Observed Expected (Observed - Expected)^2/Expected Wild type female 150 160 0.625 Wild type male 165 160 0.15625 White eye female 170 160 0.625 White eye male 155 160 0.15625 Sum 1.5625

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