同染色體性別是指一個物種的性別中,其兩條性染色體為相同的。以人為例,女性的性染色體由兩條X染色體組成,為兩條相同的性染色體。雌性即為同染色體性別。[1]

在部分的鳥類爬蟲類中採用的是ZW性別決定系統,雄性動物的性染色體為ZZ,則該物種中,雄性為同染色體性別。[2]

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