The allele for a widowís peak has complete dominance over the allele for a straight hairline (w). what is the probability of two parents heterozygous for a widowís peak (ww) having an offspring with a widowís peak?
75 percent
50 percent
0 percent
25 percent

=

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.