psych ch 12

psych ch 12 - Ch. 12: Psychology Over the Life Span Getting...

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Ch. 12: Psychology Over the Life Span Getting a Start in Life Chromosomes--strands of DNA Gametes—each contribute 23 chromosomes 23 pairs in the fertilized zygote (see fig. 12.1) Maturation: developmental process that produces genetically programmed changes with increasing age; genetically “programmed” developmental changes Example: prenatal week 8 the SRY (sex-determining region of Y chromosome) gene on the Y chromosome activates, triggers cell development-->production of testosterone XX = female XY = male Stages of Development in the Womb Prenatal Stages: Zygote: fertilized egg Embryo: developing baby from the point where the major axis of the body is present until all major structures are present; 2 weeks to 8 weeks after conception Fetus: developing baby during the final phases in the womb; 8 weeks until birth Most neurons present at birth: ~80% of adult brain size by age 2 Continued growth due to: Synaptogenesis Myelination Dendritic branching Learning and Behavior in the Womb
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psych ch 12 - Ch. 12: Psychology Over the Life Span Getting...

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