Concept:Fertilization is the fusion of two gametes, bringing together genes from both parents to form a new genetic combination.Explanation:In the diagram, the parts show stages from gamete formation to the production of a new organism.Part III represents the process where the male and female gametes unite.This union mixes the genetic material from two different parents in one zygote.Hence, recombination of genes at fertilization is represented by the part labelled III.Answer:C. III
