DP Chapter 3 - Chapter 3 Genes, Environment, and...

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Click to edit Master subtitle style 5/11/09 Chapter 3 Genes, Environment, and PSY 231 A Eric Limegrover
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5/11/09 Chapter 3: Genes & Environment Species Heredity Genetic endowment Common to the species Governs maturation and aging Human examples Two eyes, sexual maturity at 12-14 yrs. Natural Selection: Genes allowing adaptation are passed on
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5/11/09 Evolution Charles Darwin (1809-1882) Species characteristics How they change over time Main Arguments Genetic variation exists in all species Some genes aid in adaptation Kettlewell’s Moths: Genetic variability provides for adaptation
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5/11/09 Modern Evolutionary Perspectives What we do today was adaptive for ancestors Example: mothers invest more in child rearing Maternity is certain; paternity may not be Evolution: gene/environment interaction Traits are demanded by environment Advantageous genes for a particular environment survive
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5/11/09 Individual Heredity - The Genetic Code Zygote: union of sperm and ovum 23 pairs of chromosomes Each pair influences one characteristic Pair: One from father one from mother Meiosis: produces sperm and ova Mitosis: cell-division process Creates new cells Throughout life-span
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5/11/09 Genetic Uniqueness & Relatedness Monozygotic (MZ) twins: 100% related Single zygote divides 2 genetically identical individuals Dizygotic (DZ) twins: 50% on average 2 ova fertilized by 2 sperm Siblings: 50% on average Males: XY; Females: XX
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DP Chapter 3 - Chapter 3 Genes, Environment, and...

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