Ncert Exercises & Solutions

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

NEETprep Answer:

(a) A primary spermatocyte compleles the first meiotic division (reduction division) leading to formation of two squal, haploid cells calle secondary spermatocytes (n= 23 chromosomes each). The secondary spermatocytes undergo lhe securid meiotic division to produce four equal, haploid spermatids (n)., cach spermatids produce spermatazoa.

(b) The mitotic civision called cleavage starts 30 h after fertilisalion when as to the zygole moves through the isthmus the Fallopian tube (oviduct) towards the uterus and forms biastameres.

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