Chapter-8-Developmental_Psychology

Chapter-8-Developmen - thelifespanof Development Through the Life Span Stages PrenatalDevelopment development Whataresomethreats

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Developmental Psychology
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Developmental Psychology The branch of psychology that studies  the systematic changes that occur during  the life span Stages of Development Through the Life Span
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Prenatal Development What are the major stages of prenatal  development? What are some threats to prenatal  development ?
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Prenatal Development
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 Egg and sperm: only 23  chromosomes (not 23 pairs)  Egg biggest cell in Body  (pinprick)  Many sperm enter vagina.  Only  one can reach egg  Egg changes to be impenetrable   Prenatal Development
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Conception A sperm cell breaks through the  zona  (a  hard protein shell surrounding the ovum)  and starts fertilization - the sperm cell  fuses with the ovum (egg cell)
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Human Reproduction
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Zygote Has 23 pairs of almost  identical  chromosomes One from mom, one from dad.  Each with  genetic code If they differ. Who wins? Gene Dominance :  When a person  possesses differing genes for the same  trait, one is often dominant over the other.
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Prenatal development divided into  trimesters First:  Zygote, Embryo, Fetus Second:  Differentiation  body parts and neurons in  place Third:  growth
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Germinal stage A fertilized egg cell, called a  zygote , that forms from  the fusion of sperm and ovum   undergoes cell division  Blastocyst breaks trough the zona and implants in the  uterus
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Embryonic Stage Gastrolation – “folding over” of cells to form three layers  The major organ systems begin to take shape in the  developing organism, which we now call the  embryo  
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Fetal Period Growth in size and weight All major organ systems, as well as fingers and toes,  are formed by 12th week of prenatal development
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Blastocyst Once formed, cell  begins to divide After 3 days, 60-70  cells Now called  Blastocyst
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4 weeks 6 weeks 8 weeks Early development mirrors  evolution
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Gender difference:  boys move more than girls 20 Weeks  Sensitive to light  Will move to avoid bright light 6 months   Sensitive to external  stimulation Can detect human voice The Developing Fetus
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hurts Substances: Alcohol Cigarettes Diseases AIDS Rubella (German measles)
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This note was uploaded on 10/04/2010 for the course PSY 006904 taught by Professor Troisi during the Fall '09 term at SUNY Buffalo.

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Chapter-8-Developmen - thelifespanof Development Through the Life Span Stages PrenatalDevelopment development Whataresomethreats

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