6. In guinea pig (Cavia), there are two alleles for hair colour, black and white, and two alleles for hair length, short and long. In a breeding experiment all Fl phenotypes produced from a cross between pure-breeding short-black haired and pure-breading. long white-haired parents and short black hair.
(a) Which alleles are dominant? Give reason for your answer. (b) Use cross diagrams to show both Fl and F2 results.