2022年九年级下册英语周报答案

.D依据题干信息,外展为隐性性状,湖外展与正常翅纯合子带进行杂交,B为杂合子,F2中翅外展个体出现的概率为1/4,A错误;非同源染色体上的非等位基因自由组合,图中所列基因中不能与翅外展基因进行自由组合的是紫眼基因,B错误;果蝇Y染色体与X染色体间存在非同源区段术定存在相同的基因或等位基因,C错误;性染色体上的基因控制的性状的遗传往往和性别相关联,验证伴性遗传时应分析的相对性状是红眼与白眼或直刚毛与焦刚毛,D

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