there is a flowering plant where plants can make either purple flowers or white flowers. a p1 cross was set up with true-breeding plants crossing plants with purple flowers was plants with white flowers. the f1 progeny all had purple flowers. the following results were obtained in the f2 generation: 93 purple 62 blue 11 white how many genes are involved in plant pigment, and what is the genetic explanation for the modified ratio of offspring observed? (mark 2 choices)