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=UgT5r UQ9EmQ&feature=related http://www.youtube.com/watch#!v=UgT5r UQ9EmQ&feature=related http://www.youtube.com/watch#!v=UgT5r UQ9EmQ&feature=related http://www.youtube.com/watch#!v=UgT5r UQ9EmQ&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 http://www.dnatube.com/video/1127/Human-Reproduction-Fertilization- and-Fetal-Development

8. Early Development- Gastrulation Cells in zygote form into 3 distinct layers Cells in zygote form into 3 distinct layers Endoderm: Endoderm: Digestive and Respiratory Digestive and Respiratory Mesoderm: Mesoderm: Circulatory, Muscles, Bones Circulatory, Muscles, Bones Ectoderm: Ectoderm: Nervous Nervous Skin Skin The cells within each layer will DIFFERENTIATE The cells within each layer will DIFFERENTIATE Become different (skin cells, heart cells, etc.) 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 Develops at 3 weeks Placenta is a fetal organ Placenta is a fetal organ Connects mother and fetus Connects mother and fetus PLACE OF: 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 8 weeks = FETUS Body systems become more specialized Body systems become more specialized Fetus becomes bigger Fetus becomes bigger

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