【简答题】( 2018 全国 II 卷 )某种家禽的豁眼和正常眼是一对相对性状,豁眼雌禽产蛋能力强。已知这种家禽的性别决定方式与鸡相同,豁眼性状由 Z 染色体上的隐性基因 a 控制,且在 W 染色体上没有其等位基因。回答下列问题: ( 1 )用纯合体正常眼雄禽与豁眼雌禽杂交,杂交亲本的基因型为 _____________________ ;理论上 F 1 个体的基因型和表现型为 ______________...
【简答题】When I first met Nina, I disliked her at once. She was wearing skintight pedal pushers, a flashy, floppy top, and sneakers with no socks - bizarrely inappropriate even at our very informal company. So...