Before revision: Male egg can refer to either: A nonhuman egg which contains a Z chromosome, in species with a ZW sex-determination system produced in the usual way by a female, referring to the occurrence of such an egg being fertilized by a sperm giving birth to a female .
After revision: Male egg can refer to either: A nonhuman egg which contains a Z chromosome, in species with a ZW sex-determination system produced in the usual way by a male, referring to the occurrence of such an egg being fertilized by a sperm giving birth to a female .