Ⅰ．“翻翅平衡致死系”个体的体细胞中一条2号染色体上有一显性基因Cy（curly,翻翅）,这是纯合致死的；另一条2号染色体上有另一显性基因S（star,星状眼）,也是纯合致死的.⑴“翻翅平衡致

Ⅰ．“翻翅平衡致死系”个体的体细胞中一条2号染色体上有一显性基因Cy（curly,翻翅）,这是纯合致死的；另一条2号染色体上有另一显性基因S（star,星状眼）,也是纯合致死的.⑴“翻翅平衡致
Ⅰ．“翻翅平衡致死系”个体的体细胞中一条2号染色体上有一显性基因Cy（curly,翻翅）,这是纯合致死的；另一条2号染色体上有另一显性基因S（star,星状眼）,也是纯合致死的.
⑴“翻翅平衡致死系”雌雄个体相互交配,其遗传图解如下,请补充完善该图解：
Cy + × Cy +
+ S + S
翻翅星状眼 翻翅星状眼
F1
⑵由上述遗传图解,可以得出的结论是：_____.
Ⅱ．现有一批经诱变处理的雄果蝇,遗传学家用翻翅作标志性状,利用上述平衡致死系设计了如下的杂交实验,通过三代杂交实验,就可以判断出这批雄果蝇2号染色体的其他位置上是否带有隐性突变或隐性致死突变基因,用M和N表示要鉴定的野生型果蝇的两条2号染色体,如下：
⑴将诱变处理后的雄果蝇与“翻翅平衡致死系”的雌蝇交配,得F1,F1有_____种类型的个体（不考虑雌雄差异）；
⑵在F1中选取翻翅雄蝇,再与“翻翅平衡致死系”的雌蝇单对交配,分别饲养,得到F2,F2有_____种类型的个体（不考虑雌雄差异）；
⑶在F2中选取翻翅雌雄个体相互交配,得到F3.预期结果和结论：\x05
①若F3中有1/3左右的野生型果蝇,则说明___.
②若F3中只有翻翅果蝇,则说明___________.
③若F3中除翻翅果蝇外,还有1/3左右的突变型,则说明___________________.
⑷若该隐性突变发生在X染色体上,位于X与Y的非同源区段上,则采用上述的方案,应在_____（F1、F2、F3）代,就可得到结果.
Ⅰ．⑴ ；⑵“翻翅平衡致死系”的雌雄个体交配,其后代总是翻翅星状眼的个体,能非常稳定地遗传.Ⅱ．⑴四；⑵三；⑶最初第2染色体上不带致死基因//最初第2染色体含有致死基因//最初第2染色体上会有隐性可见突变基因；⑷F2.

Ⅰ．“翻翅平衡致死系”个体的体细胞中一条2号染色体上有一显性基因Cy（curly,翻翅）,这是纯合致死的；另一条2号染色体上有另一显性基因S（star,星状眼）,也是纯合致死的.⑴“翻翅平衡致
I（1）Cy cy Ss × Cy cySs
FI 基因为CYcySs 因为翻翅星状眼是纯合子显性致死 翻翅平衡致死系的雌雄个体交配得到的CYCYSS和cycyss全部死亡
II(1)四种基因为CYCYSS CYcySS CYCYss cycyss
（2）即答案(1）前3种CYCYSS CYcySS CYCYss 与CYCYSS 交配得
CYCYSS CYcySS CYCYSs三种

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