Download
gamete formation in animals n.
Skip this Video
Loading SlideShow in 5 Seconds..
Gamete Formation in Animals PowerPoint Presentation
Download Presentation
Gamete Formation in Animals

Gamete Formation in Animals

204 Vues Download Presentation
Télécharger la présentation

Gamete Formation in Animals

- - - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

  1. Gamete Formation in Animals Spermatogenesis Oogenesis Both Spermatogenesis and Oogenesis involve the process of meiosis, but they take place in different ways

  2. Spermatogenesis • The process of creating sperm. • Takes place in the Testes of most animals. • The process begins with a diploid (2n) cell called a Spermatogonium. • At the beginning of puberty, the Spermatogonia reproduce through Mitosis.

  3. Spermatogenesis

  4. Spermatogenesis • These diploid cells then undergo Meiosis to form 4 Haploid (n) cells. • After Meiosis II, the new haploid cells undergo a final set of developmental stages. • Afterwards, the cells are mature Sperm.

  5. Oogenesis • The process of creating egg cells • Takes place in the ovaries of most animals • The process begins with a diploid (2n) cell called an oogonium. • Oogonia reproduce by mitosis before birth and begin meiosis, but stop at Prophase I.

  6. Oogenesis • There is an uneven distribution of cytoplasm after meiosis I. • The cell with most of the cytoplasm continues through meiosis I and II to form an egg. • The other products are called polar bodies and degenerate. • Meiosis II is not completed unless the egg is fertilized by a sperm cell.

  7. Multiple Births

  8. Errors During Meiosis

  9. Cri du Chat

  10. Klinefelters

  11. Down’s Syndrome

  12. Turner Syndrome