The fertilized zygote undergoes rotational holoblastic cleavage. A spermatozoon joins an ovum to form a zygote. The resulting zygote develops into an embryo inside the ovule. Two organisms of opposing sex contribute their haploid gametes to form a diploid zygote. Two gametes fuse to form a zygote which develops into a new sporophyte. The fertilized egg cell is known as the zygote. The flagellated microgamete fertilizes the female macrogamete to produce a diploid cell called a zygote. The zygote incorporates genetic material from both gametes. The exact cause for the splitting of a zygote or embryo is unknown. The male and female gametes combine to produce the zygote cell. This process ultimately leads to the formation of a diploid cell called a zygote. The complete fusion of 2 gametes results in the formation of zygote. Germline mutations can occur before fertilization and during various stages of zygote development. Fertilization leads to the formation of a zygote. The resulting zygote germinates into a resting spore.