Download - Gamete Formation in Animals
![Page 1: Gamete Formation in Animals](https://reader033.vdocument.in/reader033/viewer/2022061608/568166b4550346895ddab8c5/html5/thumbnails/1.jpg)
Gamete Formation in Animals
SpermatogenesisOogenesis
• Both Spermatogenesis and Oogenesis involve the process of meiosis, but they take place in different ways
![Page 2: Gamete Formation in Animals](https://reader033.vdocument.in/reader033/viewer/2022061608/568166b4550346895ddab8c5/html5/thumbnails/2.jpg)
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.
![Page 3: Gamete Formation in Animals](https://reader033.vdocument.in/reader033/viewer/2022061608/568166b4550346895ddab8c5/html5/thumbnails/3.jpg)
Spermatogenesis
![Page 4: Gamete Formation in Animals](https://reader033.vdocument.in/reader033/viewer/2022061608/568166b4550346895ddab8c5/html5/thumbnails/4.jpg)
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.
![Page 5: Gamete Formation in Animals](https://reader033.vdocument.in/reader033/viewer/2022061608/568166b4550346895ddab8c5/html5/thumbnails/5.jpg)
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.
![Page 6: Gamete Formation in Animals](https://reader033.vdocument.in/reader033/viewer/2022061608/568166b4550346895ddab8c5/html5/thumbnails/6.jpg)
![Page 7: Gamete Formation in Animals](https://reader033.vdocument.in/reader033/viewer/2022061608/568166b4550346895ddab8c5/html5/thumbnails/7.jpg)
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.
![Page 8: Gamete Formation in Animals](https://reader033.vdocument.in/reader033/viewer/2022061608/568166b4550346895ddab8c5/html5/thumbnails/8.jpg)
Multiple Births
![Page 9: Gamete Formation in Animals](https://reader033.vdocument.in/reader033/viewer/2022061608/568166b4550346895ddab8c5/html5/thumbnails/9.jpg)
Errors During Meiosis
![Page 10: Gamete Formation in Animals](https://reader033.vdocument.in/reader033/viewer/2022061608/568166b4550346895ddab8c5/html5/thumbnails/10.jpg)
Cri du Chat
![Page 11: Gamete Formation in Animals](https://reader033.vdocument.in/reader033/viewer/2022061608/568166b4550346895ddab8c5/html5/thumbnails/11.jpg)
Klinefelters
![Page 12: Gamete Formation in Animals](https://reader033.vdocument.in/reader033/viewer/2022061608/568166b4550346895ddab8c5/html5/thumbnails/12.jpg)
Down’s Syndrome
![Page 13: Gamete Formation in Animals](https://reader033.vdocument.in/reader033/viewer/2022061608/568166b4550346895ddab8c5/html5/thumbnails/13.jpg)
Turner Syndrome