When studying finches, charles darwin noticed that within the population of finches, there were three distinct traits. the shape of the beak, the color of their belly, and the length of tail feathers. straight beaks are dominate over curved beaks. red bellies are recessive to magenta bellies. short tail feathers are recessive to long tail feathers. describe the possible phenotypes of the parents of a bird who is homozygous recessive for beak shape, heterozygous for belly color, and heterozygous for tail length. identify the genotypes of offspring and the ratios if this bird mated with a bird who was heterozygous for beak shape, homozygous for belly color, and heterozygous for tail length.