Q. How many spermatozoa will be produced by 200 primary spermatocytes and how many ova are produced by 100 primary oocytes?
Solution:
Each primary spermatocyte undergoes meiotic division and generates two haploid secondary spermatocytes (Meiosis I) which in turn further undergoes second meiotic division (Meiosis II) which again generates two haploid cells each. So one primary spermatocyte gives rise to four spermatids that mature into spermatozoa.
Oocyte undergoes first meiotic division (Meiosis I) which generates two haploid cells, but one becomes a polar body due to unequal cell division, and the other remain functional. A similar process happens during the second meiotic division (Meiosis II), and therefore one oocyte gives rise to only one ovum (one functional ovum and three polar bodies which degenerate later on).
So, here, 200 primary spermatocytes are going to give rise to 800 sperms and 100 primary oocytes going to give rise to 100 ova.
Oocyte undergoes first meiotic division (Meiosis I) which generates two haploid cells, but one becomes a polar body due to unequal cell division, and the other remain functional. A similar process happens during the second meiotic division (Meiosis II), and therefore one oocyte gives rise to only one ovum (one functional ovum and three polar bodies which degenerate later on).
So, here, 200 primary spermatocytes are going to give rise to 800 sperms and 100 primary oocytes going to give rise to 100 ova.