12.C精子形成过程中,X染色体和Y染色体在减数第一次分裂后期分离,次级精母细胞可能不含Y染色体A倩误:在卵细胞形成过程中,初级卵母细胞和次级卵母细胞的细胞质分裂都不是均等的,因此每个卵细胞继承了初级卵母细胞大部分的细胞质,B错误:正常情况下受精卵中来自父母双方的染色体各占一半,C正确;正常情况下受精卵中的核基因父母双方一样多,但质基因主要由母方提供,D错误
One possibl
第三节One possible wersionParagraph 1I was tired. My arms were really heavy and I felt as ifthey were on fire. We were made up and down by thewaves.I didnt know how much longer I could pull that oar