1.一个基因型为AaBb的卵原细胞按自由组合规律遗传,结果产生了一个基因型为Ab的卵细胞,则随之产生的三个极体的基因型是()。 A.Ab,Ab,aB; B.aB,aB,Ab; C.AB,Ab,aB; D.ab,ab,Ab。 2.南瓜的圆果(A)对长果(a)是显性,黄果(G)对白果(g)是显性。用白圆果与黄长果两个纯种杂交,F_1表现型一致;F_1自交得到48株F_2代,其中黄圆24株,黄长12株,白圆12株。上述遗传属于();亲本的基因型是()和()。 3.为了促进植物的根细胞多吸收矿质元素的离 1. An oocyte with genotype AaBb is inherited according to a free combination law. As a result, an egg cell with a genotype of Ab is produced, and then the genotype of the three polar bodies produced is (). A. Ab, Ab, aB; B. aB, aB, Ab; C. AB, Ab, aB; D. ab, ab, Ab. 2. The round fruit of the pumpkin (A) is dominant to the long fruit (a) and the yellow fruit (G) is dominant to the ginkgo (g). The F_1 phenotypes were identical between the white round fruits and the yellow long fruit hybrids. 48 F2 generations were obtained by self-crossing of F_1, among which 24 were Huangyuan, 12 were Huangchang and 12 were Baiyuan. The above genetic belongs to (); the parent’s genotype is () and (). 3. In order to promote the removal of mineral elements from the plant’s root cells