has characteristic capable of male germ cell gamete male gamete Any male germ cell that has characteristic some haploid and is capable of some fertilization. https://cellxgene.cziscience.com/cellguide/CL_0000408 BTO:0001277 CALOHA:TS-0949 The male gamete, also known as a sperm cell, is a highly specialized cell type critical to sexual reproduction. Sperm are produced during a process called spermatogenesis within the male reproductive organ, specifically the testes. They are haploid cells, carrying the genetic material from the male parent, and fuse with the ovum, the female gamete, to form a diploid zygote during fertilization, thereby initiating gestation and the development of a new organism. The male gamete is distinguished by its morphology, notably its elongated shape which is geared towards locomotion. One of the primary characteristics of a male gamete is its flagellum, or tail, which propels the cell towards the female gamete. It additionally contains an elongated head region housing the nucleus, where the genetic material is stored. The anterior section of the head, the acrosome, releases enzymes essential for penetrating the protective layers of the ovum during the fertilization process. The function of male gametes does not cease upon fertilization. In addition to delivering the paternal set of chromosomes, fusion of the sperm cell with the ovum causes an increase in cytosolic Ca2+ which then activates the female egg cell to undergo the so-called cortical reaction during which the egg’s zona pellucida is changed so fusion with additional sperm is prevented. The Ca2+ signal also initiates the development of the zygote and eventual formation of an embryo. Male gametes also contribute towards forming the placenta, which supplies nutrients and removes waste products during gestation. (This extended description was generated by ChatGPT and reviewed by the CellGuide team, who added references, and by the CL editors, who approved it for inclusion in CL. It may contain information that applies only to some subtypes and species, and so should not be considered definitional.) fertilization haploid