Mendelian Genetics and Chi Square - (Sep/28/2009 ) A poultry
geneticist made reciprocal crosses between two true-breeding
strains of fowl, one with rose combs and white feathers, and the
other with single combs and black feathers. The F1 phenotypes
were not recorded, but the F1 were crossed with the truebreeding
chickens with rose combs and white feathers and the true-
breeding chickens with single combs and black feathers. The
results are the crosses are shown. Make a hypothesis concerning
the number of genes involved and the allelic relationship for
each gene. Choose appropriate notation and indicate the
genotypes of the parents, gametes produced by them and the
resulting genotypes and phenotypes in each cross, byusing a
Punnett Square or Branch Diagram. Test your hypothesis using the
data from each cross with a Chi Square Test. Homework - what do
you think the answer is! We won't help you unless you help
yourself! Based on the numbers it seems that black & white are
codominant, and rose is dominant over sin