题目

Tracy Wong is a well-known Chinese-American writer. But her writing __ 16__ was something she picked up by herself. After her first__ 17__, teaching disabled children, she became a part-time writer for IBM. __ 18__, writing stories was simply a __ 19__ interest. Tracy sent three of her stories to a publisher. __20___, they immediately suggested that she put them together to make a single one long __21___ and paid Tracy a $ 15,000 in advance. “A pretty money,” said the publisher, “for __22___ writer.”    __23___ Tracy’s characters are interesting, her stories sometimes __24___18．果蝇无眼色基因的受精卵不能发育为个体．一只野生型的雄果蝇与一只纯合白眼雌果蝇杂交，子代雄果蝇全为白眼，雌果蝇中仅有一只为白眼（染色体数正常），其余全为红眼．对此现象以及子代白眼雌雄产生的原因分析不合理的是（　　）A．眼色性状的遗传遵循孟德尔的基因分离定律B．眼色基因在X染色体上且红眼对白眼是显性C．子代白眼雌果蝇不可能是由染色体缺失产生D．子代白眼雌蝇与正常雄蝇交配可判定产生原因