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【单选题】
鸡的k基因是伴性遗传的隐性致死基因。含k基因的杂合子雄鸡与正常的雌鸡交配，共孵化出120只小鸡。请问这120只鸡中雌雄的比例是多少（提示：鸡的性别决定为ZW型）?A.
雌：雄=80：40
B.
雄：雌=80：40
C.
雌：雄=60：60
D.
雌：雄=100：20
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