My claim is: The presence of a dominant -recessive relation ship from a pair of alleles can be shown by the probabilities of different traits in offspring. An example would be a purple colored allele, P, in a plant crossed with a plant having white flower color, W. The results would of possible combinations could be PP, WW, and PW. What could be evidence to support this ? For example the relationship among DNA, genes, alleles, and chromosomes. what role does each play in patterns of Inheritance?