Home >Documents >Fertilization and Development Gestation. Fertilization Internal Fertilization – Mammals, Birds,...

Fertilization and Development Gestation. Fertilization Internal Fertilization – Mammals, Birds,...

Date post:28-Dec-2015
Category:
View:228 times
Download:1 times
Share this document with a friend
Transcript:

PowerPoint Presentation

Fertilization and DevelopmentGestationFertilizationInternal FertilizationMammals, Birds, ReptilesSmall # of offspringExternal FertilizationFish, AmphibiansLarge #s of offspring

Internal vs. External DevelopmentInternal Offspring develop inside of the mothers uterusSmall # of offspringOffspring are protected during developmentMammals - mainly land dwelling but whales and dolphins are exceptionsExternalOffspring develop outside of the females body, usually in waterLarge # of offspringOffspring are not well protectedBirds, reptiles, amphibians and fishEarly Stages of DevelopmentZygote fertilized eggMorula solid ball of cellsBlastula larger hollow sphere of cellsGastrula infolding of the blastula forms layers

Layers of the GastrulaEndodermInner layerForms organs spinal cord and brainMesodermMiddle layerForms muscles and bonesEctodermOuter layerForms skin

PlacentaDelivers oxygen, water, sugar and nutrients to the fetusRemoves carbon dioxide, urea and other waste products produced by the fetus

Popular Tags:
of 6/6
Fertilization and Development Gestation
Embed Size (px)
Recommended