PSY 101 Lecture 11-2-11

PSY 101 Lecture 11-2-11 - Developmental Psychology...

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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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Teratogens: When the environment hurts Substances: Alcohol Cigarettes Diseases AIDS Rubella (German measles) Mom’s stress level Babies with attention difficulties Anxiety Unusual social behavior Why? Flight or flight response draws blood away from fetus Teratogens: Things in the environment that affect the developing fetus.
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This note was uploaded on 11/10/2011 for the course PSY 101 taught by Professor Dan during the Fall '08 term at SUNY Buffalo.

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PSY 101 Lecture 11-2-11 - Developmental Psychology...

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