Could two parents with cleft-chin have a child without cleft-chin?

Cleft chins were believed to be a dominant trait: if two parents had cleft chins, their kids could have a cleft or might not  But it turns out a cleft chin is too complicated to be simply dominant. Two parents without a cleft have kids with cleft chins way more often than predicted with this simple model.

Explanation:

x would be the most and the least would be y because there are more fruit   and seeds than flock z has insects

b is the answer and if you need further with anything message me