Spermatogenesis And Oogenesis Question And Answers

Enumerate the stages of normal spermatogenesis.
Answer:

The cell stages in spermatogenesis are as follows.

1. The spermatogonia (type A) or germ cells.
   • Type A cells divide mitotically.
     Result: More spermatogonia type A and also spermatogonia type B.
     No. of chromosome: 44+X+Y.
2. The spermatogonia (type B).
   • They enlarge or undergo mitosis.
     Results: Formation fof primary spermatocytes.
     No. of chromosome: 44 + X + Y
3. The primary spermatocytes (44+ X + Y)
   • They divide so that each forms two secondary spermatocytes.
   • It is first meiotic division.
   • No. of chromosome: Reduced to half, 22+ X or 22+ Y
4. Secondary spermatocytes.
   • It divides to form two spermatids.
   • It is second meiotic division.
   • No. of chromosome: 22+ X or 22+ Y
5. Spermatid.
   • It gradually changes its shape to form spermatozoon.
   • It is called spermiogenesis.
   • No. of chromosome: 22+ X or 22 +Y.

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Time period:

It takes about two months for the completion of the process.

Results: Spermatids are formed.

• They are more or less circular cell.
• They contain.

1. 1. Nucleus forming head.
   2. Golgi apparatus – transforms into acrosomic cap.
   3. Centriole divides into two parts.
      • One becomes spherical and lie in neck.
      • The remaining part elongates to form tail.
   4. Mitochondria.

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