What is the relationship between haploid and diploid cells during fertilization?

During fertilization, the relationship between haploid and diploid cells is characterized by the merging of haploid cells to create a diploid zygote. In sexual reproduction, gametes (which are haploid cells) from each parent unite during fertilization. Each gamete carries half the genetic material necessary for the creation of a new individual.

When a sperm cell (haploid) fertilizes an egg cell (also haploid), the genetic material from both cells combines, resulting in a diploid zygote. This zygote contains a full set of chromosomes, with one set from each parent, effectively restoring the diploid number. This process is fundamental to the life cycle of organisms that reproduce sexually, as it ensures genetic variation and continuity of species.