In Drosophila, singed bristles (sn)and carnation eyes (car)are both caused by recessive X-linked alleles.The wild-type alleles (sn + and car + )are responsible for straight bristles and red eyes, respectively.A sn car female is mated to a sn + car + male and the F 1 progeny are interbred.The F 2 are distributed as follows: $$\begin{array} { | l | r | } \hline s n~ c a r & 55 \ \hline s n~ c a r^+ & 45\ \hline s n ^{+ c a r} & 45 \ \hline s n ^ { + c a r +} & \underline{55} \ \hline & 200 \ \hline \end{array}$$ -What is the ?² value for a chi-square test for goodness of fit of the null hypothesis? A)0.5 B)1.0 C)2.0 D)0.4 E)20

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The chi-square test for goodness of fit is used to test whether a sample of data fits a specified distribution. The null hypothesis is that the data fits the distribution, and the alternative hypothesis is that the data does not fit the distribution. The chi-square statistic is calculated by summing the squared differences between the observed and expected frequencies for each category, and then dividing by the expected frequencies. The ?² value is the value of the chi-square statistic, and it is used to determine the p-value for the test. The p-value is the probability of obtaining a chi-square statistic as large as or larger than the observed value, assuming that the null hypothesis is true. If the p-value is less than the significance level, then the null hypothesis is rejected and the alternative hypothesis is accepted.

In Drosophila, Singed Bristles (Sn)and Carnation Eyes (Car)are Both Caused