During spermatogenesis, chromosome no. reduces to haploid at:-
At mitosis
Meiosis -I
Meiosis-II
None of above
The first meiotic division is known as the reduction division in which each primary spermatocyte yields two secondary spermatoctyes. Each contains 23 (Haploid) chromosomes consist of two varieties 22+X and 22+Y. Here 22 are autosomes and X & Y are sex chromosomes.
Introduction and gametogenesis.