CBSE Class 12-science Answered

Spermatogenesis

Oogenesis

• It occurs in the testes.

• It occurs in the ovaries.

• Spermatogonia change to primary spermatocytes.

• Oogonia change to primary oocytes.

• A primary spermatocyte divides to form two secondary spermatocytes.

• A primary oocytes divides to form one secondary oocyte and one polar body.

• A secondary spermatocyte divides to form two spermatids.

• A secondary oocyte divides to form one ootid and one polar body.

• No polar body is formed.

• Two polar bodies are formed.

• One spermatogonium forms four spermatozoa.

• One oogonium forms one ovum.

• Sperms are minute, yolkless and motile.

• Ova are much bigger with yolk and non-motile.