-classification type A dark type A(Ad): ovoid, deep-stained N,stem cell - Pale type A(Ap): ovoid, pale-stained n differentiate into type B type B: round N, chromatin granules are distributed under nucleus membrane division and differentiate into primary spermatocyte
---classification: type A: -dark type A(Ad): ovoid, deep-stained N, stem cell -Pale type A(Ap): ovoid, pale-stained N, differentiate into type B type B: round N, chromatin granules are distributed under nucleus membrane, division and differentiate into primary spermatocyte
b primary spermatocytes ---diploid(2ncell duplicate DNA tetraploid cell(4n) →dMs|on -structure C round cell, become largest, 18 um, left the basal layer N: large, round, on different stage of division (the prophase of meiotic division up to 22 days) through first meiosis divides into two secondary spermatocyte(2n, 23X or 23Y
b. primary spermatocytes ---diploid(2n)cell →duplicate DNA → tetraploid cell(4n) →division ---structure: round cell, become largest, 18 um, left the basal layer N: large, round, on different stage of division(the prophase of meiotic division up to 22 days) ---through first meiosis divides into two secondary spermatocyte(2n, 23X or 23Y)