A population of toads in the desert has a range of body sizes.  The smallest and largest toads are most successful at surviving dry periods.  When they mate after heavy rains there are more small and large toads present at mating sites than there are medium toads.  The toads mate randomly with respect to body size (i.e.large and small toads interbreed easily).  Body size is a quantitative trait under genetic control. What do you expect to happen in this situation?

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Inheritance and Mendelian Genetics

Inheritance means the passing of traits to offspring from parents. These traits could be passed either through asexual reproduction or sexual reproduction. The offspring receives the genetic material from the parents. Mendelian inheritance is a certain biological inheritance that follows the rules and principles laid down by Gregor Mendel in 1865. The initial hypothesis was considered wrong, but other inheritance theories modified the concept of inheritance and thus genetics.