Caterpillars have hair-like bristles on the back side of their bodies. the bristles can be long or short. caterpillars with short bristles have two recessive alleles (ss) for the trait. a Caterpillar that is heterozygous for the bristle trait is crossed with a Caterpillar that has short bristles. the cross produces 220 offspring. how many of the offspring are expected to have short bristles?