Chapter 4, Problem 16EQ

Summary Introduction

To analyze:

The cream allele in fruit flies is autosomal, and it acts as modified of eosin. In comparison, the red and eosin alleles are X-linked.

Based on the given data, calculate a chi-square analysis from the Bridges’ data in belowfigure to estimate- if the predicted ratio from the table agrees or not.

$\text{8}$	red-eyed females
$\text{4}$	red-eyed males
$\text{3}$	light eosin-eyed males
$\text{1}$	cream-eyed male agrees or not

Introduction:

In genetic crosses, to know whether the data is significant or whether it fits in any of the Mendelian ratios, aChi-square test $\text{2}\left(\text{χ}\right)$ is performed. When a genetic cross is performed, the genotypes are given and the phenotypic ratio is predicted by a hypothesis. Chi-square test $\text{2}\left(\text{χ}\right)$ allows determining the accuracy of the prediction or hypothesis on observed and expected values or ratios. For Mendelian genetic crosses, Chi-square $\text{2}\left(\text{χ}\right)$ Goodness of Fit (one sample) test is performed.

The test is performed in a series of steps-

$\text{1}$. Hypotheses (Null and Alternative), $\text{2}$. Calculating chi-square test statistic, $\text{3}$. Determine the Degree of Freedom df and p-value, $4$. The decision about the null hypothesis, $5$. Conclusion.