9-7 - Chapter 2 Prenatal Development The Birth Experience...

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Chapter 2 Prenatal Development The Birth Experience The Newborn Infant Conception Results from the union of two gametes, the egg and the sperm Egg Largest human cell, only one visible to the naked eye Emits 'come hither' signal that attracts sperm (p44-45) Sperm Travels about 6 hours, covering 6-7 inches Approximately 120 to 150 males are conceived for every 100 females because the sperm bearing the Y Chromosome swim faster and are lighter Fertalized egg Zygote full complement of human genetic material (half from each parent) Four processes that transform zygote to embryo Cell division Cell migration Cell Differentiation The selective death of certain cells (apoptosis) also enables prenatal development Role of Hormones Cause for sex differences Hormones is the reason for active child affect the child's own development Protecting the Fetus Barrier within the placenta Placenta Protects blood stream between the mother and baby
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This note was uploaded on 01/24/2012 for the course PSYC 307 taught by Professor Staff during the Fall '08 term at Texas A&M.

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9-7 - Chapter 2 Prenatal Development The Birth Experience...

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