Mendel kept careful numerical data describing the results of his pea experiments. He knew that if alleles segregated randomly when forming gametes, mathematical probability should predict the outcome of the F2 generation. His true-breeding parent plants were homozygous, RR or rr. This cross resulted in an F1 generation of heterozygous plants, Rr. 1. What phenotypes would you predict in the F2 generation?

Lactase is essential for digesting lactose in milk. this enzyme is specific for this sugar. why? molecules and active sites vary in size; only properly sized molecules can fit. there is a precise compatibility between the active site and the lactose molecule. specificity refers to the action of the enzyme, such as hydrolysis, and relatively few molecules can be hydrolyzed. reaction-specific enzymes assume a fit by folding around the most numerous substrate molecules.