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【单选题】
玉米的高秆 (H) 对矮秆 (h) 为显性。现有若干 H 基因频率不同的玉米群体,在群体足够大且没有其他因素干扰时,每个群体内随机交配一代后获得 F 1 。各 F 1 中基因型频率与 H 基因频率 (p) 的关系如图。下列分析错误的是 ( )A.
0 ＜ p ＜ 1 时，亲代群体都可能只含有纯合子
B.
只有 p ＝ b 时，亲代群体才可能只含有杂合子
C.
p ＝ a 时，显性纯合子在 F 1 中所占的比例为1/9
D.
p ＝ c 时， F 1 自交一代，子代中纯合子比例为5/9
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