Who is expressing the trait? Who is not? Are there carriers?
How can you tell what type of trait is being tracked

Which material is commonly used as a culture medium for living cells

Climate like that in the sahara desert have the fastest rates of weathering

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.