Abyssinian guinea pigs have a rosette (long and bushy) coat that is controlled by a dominant gene. a short and smooth coat is recessive to the rosette allele. a breeder conducts a testcross to see if his abyssinian guinea pig is homozygous or heterozygous. if the pig is homozygous, what is the phenotypic ratio in the offspring? 100% rosette coats 50% rosette coats 50% smooth coats 75% rosette coats 25% smooth coats 100% smooth coats