Genetics - Analysis and Principles 3rd Edition by Robert Brooker

تمرين 10

In fruit flies, curved wings are recessive to straight wings, and ebony body is recessive to gray body. A cross was made between true-breeding flies with curved wings and gray bodies to flies with straight wings and ebony bodies. The F 1 offspring were then mated to flies with curved wings and ebony bodies to produce an F 2 generation.
A. Diagram the genotypes of this cross, starting with the parental generation and ending with the F 2 generation.
B. What are the predicted phenotypic ratios of the F 2 generation
C. Let's suppose the following data were obtained for the F 2 generation:
114 curved wings, ebony body
105 curved wings, gray body
111 straight wings, gray body
114 straight wings, ebony body
Conduct a chi square analysis to determine if the experimental data are consistent with the expected outcome based on Mendel's laws.