假定在一个植物群体内,有两对基因 A a 和 B b 决定植株高度,效应是累加的,纯合体 AABB株50 厘米 ,而 aabb 为 30 厘米 ,则这两个个体杂交的 F 1 植株高度大约为 厘米 。
A.
50
B.
40
C.
30
D.
20
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举一反三
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