(a) How many spermatozoa are formed from one secondary spermatocyte?
(b) Where does the first cleavage division of zygote take place?

Explanation

(a) A primary spermatocyte completes the fisrt meiotic division (reduction division) leading to formation of two equal, haploid cells called secondary spermatocytes (n=23 chromosomes each). The secondary spermatocytes undergo the second meiotic division to produce four equal, haploid spermatids (n)., ecah spermatids produce spermatazoa.
(b) The mitotic division called cleavage starts 30 h after fertilisation when as to the zygote moves through the isthmus the Fallopin tube (oviduct) towards the uterus and forms blastomeres.