However , if the female lacked the gene , she no longer preferentially chose mated males , and no longer avoided infected single males .
然而如果雌性鼠缺乏该基因,她就不会再偏好于选择已经婚配的雄性鼠,不再回避感染寄生虫的单身雄性鼠。
Elizabeth gould of princeton university and her colleagues compared the brains of marmoset fathers with those of males that lived in mated pairs , but lacked offspring .