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The ZW sex-determination system is a chromosomal system that determines the sex of offspring in birds, some fish and crustaceans such as the giant river prawn, some insects (including butterflies and moths), the schistosome family of flatworms, and some reptiles, e.g. majority of snakes, lacertid lizards and monitors, including Komodo dragons.
Jan 31, 2011 · In birds and mammals, sex determination occurs at fertilization with the inheritance of the sex chromosomes. Sexual differentiation subsequently occurs and involves gonadal sex differentiation, producing either ovaries or testes.
Jun 2, 2018 · The sex of birds is determined by the inheritance of sex chromosomes. Females have the heterogametic sex chromosomes ZW, whereas males have the homogametic ZZ. This sex-determining system is highly conserved in avians, which include nearly ten thousand species.
Mar 3, 2021 · Our analysis shows that DMRT1 is the key sex determination switch in birds and that it is essential for testis development, but that production of estrogen is also a key factor in primary sex determination in chickens, and that this production is linked to DMRT1 expression.
In birds, sex is determined by chromosomes known as the Z and W, and females are the heterogametic sex. Early on, it was apparent that there were notable differences in the mechanisms...
In birds, Z and W chromosomes determine sex, with females being the heterozygous sex. Avian sex determination is dependent on the presence of Z and W chromosomes. Homozygous for Z (ZZ) results in a male, while heterozygous (ZW) results in a female.
In birds, sex determination occurs at fertilisation by the inheritance of sex chromosomes. This review summarises our current understanding of sex determination in birds, with emphasis on the molecular genetics of male versus female development during embryonic life.
