1. A ____ square is used to determine all combinations of how parents can pass on their alleles. 2._________ is the physical expression of a particular trait? 3. If offspring inherit a dominant black allele and a recessive white allele what is the genotype of Bb? ___________ 4. Is the dominant or the recessive allele expressed?_________ 5. The________ allele is hidden but can be passed down do the next generation PLEASE HELP ME!!!!!!