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Gametogenesis project
Gametogenesis project
Gametogenesis project
Gametogenesis project
Gametogenesis project
Gametogenesis project
Gametogenesis project
Gametogenesis project
Gametogenesis project
Gametogenesis project
Gametogenesis project
Gametogenesis project
Gametogenesis project
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Gametogenesis project

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  1. • the process by which gametes are formed.• literally “creation of gametes.”
  2. SPERMATOGENESIS
  3. • is the process by which male primary sperm cells undergo meiosis, and produce a number of cells termed spermatogonia, from which the primary spermatocytes are derived.
  4. • Spermatogonium are the germ cells that will eventually develop into the mature sperm cell.• Primary spermatocytes the first step in this development is the duplication of homologous chromosomes to get ready for meiosis.• Secondary spermatocytes the first meiotic division separates the homologous chromosomes from each parent• Spermatids the second meiotic division separates the 2 chromatids and creates 4 haploid cells. This eventually produces 4 sperm cells.
  5. OOGENESIS
  6. • Oogenesis is the creation of an ovum (an egg cell).• It is the female process of gametogenesis.• It involves the various stages of immature ova.
  7. • Oogonium are the germ cells that will eventually develop into the mature egg cell.• Primary oocyte the first step in this development is the duplication of homologous chromosomes to get ready for meiosis.• Secondary oocyte the first meiotic division separates the homologous chromosomes from each parent.• Eggs the second meiotic division separates the 2 chromatids and creates 4 haploid cells. It produces 1 egg and 3 polar bodies. This allows the egg to retain more cytoplasm to support early stages of development.
  8. OOGENESIS
  9. DIFFERENCES BETWEEN SPERMATOGENESISAND OOGENESISS P E M AT O G E N E S I S OOGENESIS• Four gametes from each • One gamete from each primary oocyte primary spermatocyte • One large gamete + 2-3 polar• Four small gametes of bodies equal size • Cytoplasm conserved in one large gamete - may increase.• Diplotene relatively short Thus, in the final gamete there• Functions in fertilization is a large amount of cytoplasm only after meiosis is • Dipotene very long - dictyate state complete • Often functions in fertilization before meiosis is complete

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