已知小麦抗锈病是由显性基因控制的,让一株杂合子小麦自交获得F

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已知小麦抗锈病是由显性基因控制的,让一株杂合子小麦自交获得F_1,淘汰掉其中不抗锈病的植株后,再自交获得F₂。从理论上计算,F2中不抗锈病的植株占总数的

A．1/4

B．1/6

C．1/8

D．1/16

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