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Wikimedia Commons has media related to Females. The ZW sex-determination system , where males have ZZ as opposed to ZW sex chromosomes, is found in birds, reptiles and some insects and other organisms. Living at Micro Scale , Chapter Main article: Sex-determination system. The sex of a particular organism may be determined by a number of factors. However, these conditions frequently result in sterility. According to Schott, [6] the most established view is that the male and female symbols are derived from contractions in Greek script of the Greek names of these planets, namely Thouros Mars and Phosphoros Venus.

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Boy or girl? It's in the father's genes

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A Y sperm and an X egg produce a male, while an X sperm and an X egg produce a female.

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The sex of a particular organism may be determined by a number of factors. The ZW sex-determination system , where males have ZZ as opposed to ZW sex chromosomes, is found in birds, reptiles and some insects and other organisms. In land plants, female and male designate not only the egg- and sperm-producing organisms and structures, but also the structures of the sporophytes that give rise to male and female plants. Some non-mammalian species, such as guppies , have analogous reproductive structures; and some other non-mammals, such as sharks , whose eggs hatch inside their bodies, also have the appearance of bearing live young.

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