Sagot :
A Punnet Square for the AaBb x AaBb cross is shown below. Rather than the 9:3:3:1 seqregation of phenotypes normally seen with an AaBb x AaBb dihybrid cross, the phenotypic ratio is 9:3:4. There are only three different phenotypes for hair color, agouti, black and albino.
Answer:
genotype ratio : AA : AAbb : bbAA : bbbb
phenotypic ratio: haired: bald