fertilization and development
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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 – FERTILIZATION OCCURS Recombination occurs: Combining of genetic info from both parents Occurs in Fallopian tube. - PowerPoint PPT PresentationTRANSCRIPT
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Fertilization and Fertilization and DevelopmentDevelopment
So that’s what happens So that’s what happens after! after!
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FertilizationFertilization DAY 0DAY 0 When sperm penetrates eggWhen sperm penetrates egg
Sperm releases special Sperm releases special enzymes to do thisenzymes to do this
Forms a Forms a ZYGOTE – ZYGOTE – FERTILIZATION OCCURSFERTILIZATION OCCURS
Recombination Recombination occurs:occurs:Combining of genetic Combining of genetic
info from both parentsinfo from both parents Occurs in Fallopian tubeOccurs in Fallopian tube
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Early Development- The First Early Development- The First WeekWeek
Zygote begins to divide, Zygote begins to divide, divide, divide divide, divide UNDERGOING UNDERGOING
MITOSIS!!!!!!!MITOSIS!!!!!!!Hopping along the Hopping along the
Fallopian Tube trail!Fallopian Tube trail! ImplantationImplantation of zygote in of zygote in
uterusuterusOccurs around day 7Occurs around day 7
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Trail of an EmbryoTrail of an Embryo
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Close up look at embryo Close up look at embryo changeschanges
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Early Development- GastrulationEarly Development- Gastrulation Cells in zygote form into Cells in zygote form into 3 distinct 3 distinct
layerslayersEndoderm:Endoderm:
Digestive and other inner organsDigestive and other inner organsMesoderm:Mesoderm:
CirculatoryCirculatoryEctoderm:Ectoderm:
NervousNervousSkinSkin
The cells within each layer will The cells within each layer will DIFFERENTIATEDIFFERENTIATE – MITOSIS!!!! – MITOSIS!!!!Become different (skin cells, heart Become different (skin cells, heart
cells, etc.)cells, etc.)
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Early Development- GastrulationEarly Development- Gastrulation
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Gastrulation: The three germ layersGastrulation: The three germ layers
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OVERVIEW OF EARLY OVERVIEW OF EARLY DEVELOMENT DEVELOMENT
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Overview of Early Development:Overview of Early Development:Stage 1- FertilizationStage 1- Fertilization
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Overview of Early Development:Overview of Early Development:Stage 2- Zygote FormationStage 2- Zygote Formation
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Overview of Early Development:Overview of Early Development:Stage 3 + 4:Stage 3 + 4:
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Overview of Early Development:Overview of Early Development:Stage 5: GastrulationStage 5: Gastrulation
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The PlacentaThe Placenta
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The Role of the PlacentaThe Role of the Placenta
Develops at 3 weeksDevelops at 3 weeks Placenta is a fetal organPlacenta is a fetal organ Connects mother and fetusConnects mother and fetus PLACE OF:PLACE OF:
RESPIRATION (GAS EXCHANGE)
NOURISHMENT (GETTING NUTRIENTS)
EXCRETION (RID OF WASTES)
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Dangers to the FetusDangers to the Fetus
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First and Second Trimester First and Second Trimester Dangers!!!!Dangers!!!!
Critical Development stageCritical Development stageDrugs, alcohol, and medicines can Drugs, alcohol, and medicines can
severely damage embryo/fetusseverely damage embryo/fetusThis can halt development or This can halt development or
cause major developmental issuescause major developmental issuesNot taking care can result in Not taking care can result in
miscarriage or severe deformities miscarriage or severe deformities of childof child
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Later DevelopmentLater Development
8 weeks = FETUS8 weeks = FETUSUmbilical cord fully formed at 3 months Umbilical cord fully formed at 3 months
(12 weeks)(12 weeks)Body systems become more Body systems become more
specializedspecializedFetus becomes biggerFetus becomes biggerTotal human gestation period = about Total human gestation period = about
40 weeks (“full term” at 37 weeks)40 weeks (“full term” at 37 weeks)
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