一、减数分裂过程中细胞数目变化的不同1个精原细胞→1个初级精母细胞→2个次级精母细胞→4个精细胞→4个精子(2种); 1个卵原细胞→1个初级卵母细胞→1个次级卵母细胞和1个极体→1个卵细胞和3个极体(2种)。例1某一生物有4对染色体。假设1个初级精母细胞在产生精细胞的过程中,其中1个次级精母细胞在 First, the difference in the number of cells in the process of meiosis 1 spermatogonia → 1 primary spermatocyte → 2 secondary spermatocytes → 4 sperm cells → 4 sperm (2 species); 1 oocyte Cells → 1 primary oocyte → 1 secondary oocyte and 1 polar body → 1 oocyte and 3 polar bodies (2). Example 1 An organism has 4 pairs of chromosomes. Assume that one primary spermatocyte is producing sperm cells and one of the secondary spermatocytes is