In pea plants, flowers are either white or purple; the purple color is produced by pigments called anthocyanins. the production of anthocyanins is a two-step process: the first is controlled by the c gene and the second by the p gene. the genes are not linked and both must produce functional proteins for anthocyanin to be expressed. for each gene, the dominant (c and p) alleles produce functional proteins. you cross two pea plants, each with the genotype ccpp. what proportion of their offspring will have white flowers?