1.如果果蝇的灰身和黑身是一对相对性状,基因位于常染色体上.将纯种的灰身果蝇和黑身果蝇杂交.F1全为灰身,让F1自由交配产生F2,让F2中灰身果蝇自由交配,后代中灰身与黑身果蝇的比例为( ),
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![1.如果果蝇的灰身和黑身是一对相对性状,基因位于常染色体上.将纯种的灰身果蝇和黑身果蝇杂交.F1全为灰身,让F1自由交配产生F2,让F2中灰身果蝇自由交配,后代中灰身与黑身果蝇的比例为( ),](/uploads/image/z/8594037-45-7.jpg?t=1.%E5%A6%82%E6%9E%9C%E6%9E%9C%E8%9D%87%E7%9A%84%E7%81%B0%E8%BA%AB%E5%92%8C%E9%BB%91%E8%BA%AB%E6%98%AF%E4%B8%80%E5%AF%B9%E7%9B%B8%E5%AF%B9%E6%80%A7%E7%8A%B6%2C%E5%9F%BA%E5%9B%A0%E4%BD%8D%E4%BA%8E%E5%B8%B8%E6%9F%93%E8%89%B2%E4%BD%93%E4%B8%8A.%E5%B0%86%E7%BA%AF%E7%A7%8D%E7%9A%84%E7%81%B0%E8%BA%AB%E6%9E%9C%E8%9D%87%E5%92%8C%E9%BB%91%E8%BA%AB%E6%9E%9C%E8%9D%87%E6%9D%82%E4%BA%A4.F1%E5%85%A8%E4%B8%BA%E7%81%B0%E8%BA%AB%2C%E8%AE%A9F1%E8%87%AA%E7%94%B1%E4%BA%A4%E9%85%8D%E4%BA%A7%E7%94%9FF2%2C%E8%AE%A9F2%E4%B8%AD%E7%81%B0%E8%BA%AB%E6%9E%9C%E8%9D%87%E8%87%AA%E7%94%B1%E4%BA%A4%E9%85%8D%2C%E5%90%8E%E4%BB%A3%E4%B8%AD%E7%81%B0%E8%BA%AB%E4%B8%8E%E9%BB%91%E8%BA%AB%E6%9E%9C%E8%9D%87%E7%9A%84%E6%AF%94%E4%BE%8B%E4%B8%BA%28+%29%2C)
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