edit Formation and Development of Zygotes. Gamete refers to a haploid sex cell that is a sperm in males and egg (oocyte) in females. Zygote is the diploid cell that results from the fertilization between an egg and a sperm.Etymology. Came from the Greek word “gametes” meaning “husband” and “gamete” meaning “wife.”. Came from the Greek word “zygotos” meaning “joined or yoked or to yoke.s a cell that fuses with another cell during fertilization (conception) in organisms that reproduce sexually. Females produced a large gamete called an egg cell while males produce a tadpole-like gamete called a sperm cell.