Pregnancy, prenatal care, and prenatal development BB Sp 12-1

Pregnancy, prenatal care, and prenatal development BB Sp 12-1

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Pregnancy, prenatal care, and  prenatal development FMSC 332 – Children in Families
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Prenatal Period 3 components of prenatal development Conception Genes and genetic abnormalities Prenatal development Disruptions to prenatal development Birth Cultural variations
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Conception Depends on appropriate timing of a chain of events Ovum ripens Ovulation (release of ovum) occurs Zygote (sperm penetrates ovum) produced Single child Fraternal twins: two ova are fertilized Identical twins: one zygote splits into two Single child Picture: page 89
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Genetic Foundation Genes Basic units of inheritance Composed of a pair of alleles Child has 2 alleles for every gene (one from mother, and one from father) Genotype and Phenotype Genotype: Genetic constitution of an individual , inherited from ancestors No two people have the same genotype Exception? Phenotype: Expression of genotype in observable characteristics of an individual We observe the_________, not the ____________
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Gene-environment interaction Genes always act within a context that influences how they are expressed Example : Phenylketonuria (PKU) Child inherits recessive genes from parents Environmental adjustments early on (e.g. low phenylalanine diet) reduces negative outcomes Without environmental intervention children have lower IQs
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Prenatal Development Conception to birth, about 38 weeks 3 Stages of Prenatal Development Germinal period Embryonic period Fetal period Prenatal development concepts: ______________ : the process by which parts of an organism progressively take on specialized forms and function involves repeated reorganizations and qualitative change New structure and capacities emerge in an orderly way
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Pregnancy, prenatal care, and prenatal development BB Sp 12-1

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