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【简答题】
已知果蝇中长翅与残翅为一对相对性状(显性基因用A表示,隐性基因用a表示),直分叉一对相对性状(显性基因用B表示,隐性基因用b表示)。两只亲代果蝇杂交得到以下子代的类型和比例,请据此回答下列问题: 表现型 长翅、直 残翅、直 长翅、分叉 残翅、分叉 雄果蝇 3/8 1/8 3/8 1/8 雌果蝇 3/4 1/4 0 0 (1) 控制直分叉遗传的基因位于________染色体上,________翅为显性性状。 (2) 亲本雌雄果蝇的基因型分别为________、________。 (3) 具有一对相对性状的纯合亲本进行正交和反交,上述两对相对性状中子代表现型不一致的是____________________,一般情况下,如果子代表现型一致,可说明控制该相对性状的等位基因位于________染色体上。
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