CHAPTER 5 You are to examine a dihybrid cross involving two genes: one autosomal gene with incomplete dominance and one sex-linked gene with codominance. The autosomal gene (with alleles A and a) influences the color of the feathers in birds, where AA results in blue feathers, Aa results in green feathers, and aa results in yellow feathers. The sex-linked gene (with alleles B and b) controls the pattern of the feathers, where B is codominant with b, resulting in the following phenotypes: XBXB: Homozygous dominant females have solid white feathers. XBXb: Heterozygous females have spotted feathers. XbXb: Homozygous recessive females have solid black feathers. XBY: Males with one copy of B have solid white feathers. XbX: Males with one copy of b have solid black feathers. Given a male bird with genotype XBX:Aa and a female bird with genotype XbXb:Aa, calculate and show the following: a) A Punnett square for the cross b) The genotypic and phenotypic ratios of the offspring (3 marks) (5 marks) c) A discussion on how sex linkage and incomplete dominance influence the outcomes of the phenotypic ratios, particularly in relation to the male and female offspring (2 marks)