PSYA02H3 Chapter Notes - Chapter 12: Fetal Alcohol Spectrum Disorder, Preterm Birth, Prenatal Development
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PSYA02H3 Full Course Notes
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cross-sectional study: individuals of different ages are simultaneously compared with respect to some test or observation. Longitudinal study: compares observations of the same individuals at different times of their lives. prenatal period: the nine months between conception and birth: divided into 3 developmental stages: zygotic, embryonic, and fetal. normal length of pregnancy is 266 days, or 38 weeks. development depends on genetic contribution from egg and sperm that determines the genotype and genetic instructions". union of ovum and sperm (conception) is the starting point for prenatal development. called teratogens: teratogens: means malformation; substances, agents, and events that can cause birth defects, beginning of sexual development occurs; 23rd chromosome pair determines sex, gonads turn into ovaries or testes. most important factor in fetus"s development is the mother"s diet what she eats is the fetus"s only source of nutrition. If mother is malnourished, the fetus"s nervous system develops abnormally, and intellectual deficits may result.
