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Developmental Psych 9 29 09

Developmental Psych 9 29 09 - Developmental Psych 9 29 09...

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Developmental Psych 9 29 09 Prenatal Development Normal development 38 weeks 3 stages Germinal Embryonic Fetal Not trimesters Fertilization Sperm and ovum unite Beginning of germinal stage Women are born with about 400 eggs and they are all the eggs they will ever produce Germinal period The point of conception – two weeks Weeks 1 – 2 Single cell Single cell divides Blastocyst ~ 30 cells (embryonic stem cells) Differentiation begins Implantation Embryonic stem cells Pluripotent: potential to become any cell in the body Regulator genes tell cells what their function is Blastocyst Unspecialized Can grow in lab, outside body “in vitro” fertilization Can differentiate into specific cell types >200 different human cell types Stem cell cultivation 1. in vitro fertilized eggs 2. blastocyst stage (5-7 days old) 3. inner stem cell mass 4. cultured undifferentiated stem cells 5.
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