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【单选题】
家蚕 (2 n = 28) 雌性体细胞内有两个异型的性染色体 ZW ,雄性体细胞内有两个同型性染色体 ZZ 。人们用辐射的方法使常染色体上带有卵色基因的片段易位到 W 染色体,使 ZW 卵和不带卵色基因的 ZZ 卵有所区别,从而在家蚕卵还未孵化时就能区分雌雄。下列有关说法错误的是 ( )A.
这种育种方式属于诱变育种
B.
辐射的目的是为了提高基因的突变率，更容易筛选到卵色基因
C.
上述带有卵色的受精卵将来会发育为雌性家蚕
D.
上述带有卵色基因的家蚕染色体组型图与正常家蚕不同
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举一反三
【单选题】Why did Gail's father oppose their marriage?
A.
Because he hated Mark took his daughter away.
B.
Because he thought Mark was poor.
C.
Because he doubted that Mark intended to remain in the USA by marrying Gail.
D.
Because he would introduce a better man to her daughter.
【单选题】Why did Gail's mother disapprove their marriage?
A.
Because Mark's color is black.
B.
Because she was afraid of friends' talk.
C.
Because she didn't like Mark.
D.
Because she worried that Gail would marry Mark for the wrong reasons that she married her husband.
【单选题】Why did Gail's mother disapprove of their marriage?
A.
Mark is black.
B.
Gail may be marrying Mark for the same wrong reasons that she married her father.
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