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(a) Describe the events of spermatogenesis with the help of a schematic representation. 

(b) Write two differences between spermatogenesis and oogenesis.

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(a)

(b)

S.No Spermatogenesis Oogenesis
(i) It is the process of formation of haploid spermatozoa from diploid male germ cells of the testes. It is the process of formation of haploid ova from the gamete mother cells (oogonia) in the ovary
(ii) It occurs in testes. It occurs in ovaries.
(iii) Spermatogonia changes to primary spermatocyte. Oogonia changes to primary oocyte.
(iv) A primary spermatocyte divides to form two secondary spermatocytes by meiosis I. A primary oocyte divides by meiosis I to form one secondary oocyte and a polar body
(v) A secondary spermatocyte divides to form two spermatids by meiosis II. A secondary oocyte divides by meiosis II to form ovum and a polar body
(vi) No polar body is formed. Polar bodies are formed.
(vii) Four spermatozoa are produced from one primary spermatocyte. One ovum/egg is produced from 1 primary oocyte.

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