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Fertilization and Development

Fertilization and Development. So that’s what happens after!!!!!!. Fertilization. DAY 0 When sperm penetrates egg Sperm releases special enzymes to do this Forms a ZYGOTE Recombination occurs: Combining of genetic info from both parents Occurs in Fallopian tube.

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Fertilization and Development

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  1. Fertilization and Development So that’s what happens after!!!!!!

  2. Fertilization • DAY 0 • When sperm penetrates egg • Sperm releases special enzymes to do this • Forms a ZYGOTE • Recombination occurs: • Combining of genetic info from both parents • Occurs in Fallopian tube

  3. After Fertilization: YouTube Clip • http://www.youtube.com/watch#!v=UgT5rUQ9EmQ&feature=related

  4. Early Development- The First Week • Zygote begins to divide, divide, divide • UNDERGOING MITOSIS!!!!!!! • Hopping along the Fallopian Tube trail! • Implantation of zygote in uterus • Occurs around day 7

  5. Trail of an Embryo

  6. Close up look at embryo changes

  7. Video Clip: After Fertilization http://www.dnatube.com/video/1127/Human-Reproduction-Fertilization-and-Fetal-Development

  8. Early Development- Gastrulation • Cells in zygote form into 3 distinct layers • Endoderm: • Digestive and Respiratory • Mesoderm: • Circulatory, Muscles, Bones • Ectoderm: • Nervous • Skin • The cells within each layer will DIFFERENTIATE • Become different (skin cells, heart cells, etc.)

  9. Early Development- Gastrulation

  10. Formation of Structures in the Embryo http://www.youtube.com/watch?v=2jRTrpSLlKo&feature=related

  11. OVERVIEW OF EARLY DEVELOMENT

  12. Overview of Early Development:Stage 1- Fertilization

  13. Overview of Early Development:Stage 2- Zygote Formation

  14. Overview of Early Development:Stage 3 + 4:

  15. Overview of Early Development:Stage 5: Gastrulation

  16. The Role of the Placenta • Develops at 3 weeks • Placenta is a fetal organ • Connects mother and fetus • PLACE OF: • RESPIRATION (GAS EXCHANGE) • NOURISHMENT (GETTING NUTRIENTS) • EXCRETION (RID OF WASTES)

  17. First and Second Trimester Dangers!!!! • Critical Development stage • Drugs, alcohol, and medicines can severely damage embryo/fetus • This can halt development or cause major developmental issues • Not taking care can result in miscarriage or severe deformities of child

  18. Later Development • 8 weeks = FETUS • Body systems become more specialized • Fetus becomes bigger

  19. Let’s see it all together! • http://www.youtube.com/watch#!v=aR-Qa_LD2m4&feature=related

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