下图甲为苹果受粉后的子房横切面示意图,乙图为发育中的结构⑥,

下图甲为苹果受粉后的子房横切面示意图,乙图为发育中的结构⑥,叙述错误的是

A.若母本基因型为Aa,无论自花还是异花受粉,结构①和⑤基因型一定为Aa,具有母系遗传的特点

B.若母本基因型为Aa,自花受粉,则②可能有三种基因型,④可能有四种基因型

C.若④的基因型为Aaa,则②的基因型一定是Aa

D.②与③发育的起点是同一个细胞,但②形成所需营养依赖③从周围组织中吸收

答案

A


解析:

子房、珠被为母本一部分,不是母系遗传。2为胚3为胚柄都来自受精卵。双受精时,每个极核与卵细胞相同,两个精子相同,都有两种情况,如下所示:

亲本(Aa)

卵细胞A        两极核AA

卵细胞a              两极核aa

精子A

AA

AAA

Aa

Aaa

精子a

Aa

AAa

aa

aaa

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