AR Psych Chapter 3
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This document summarizes key concepts from Chapter 3 of Myers' Exploring Psychology (6th Ed) on the nature and nurture of behavior and gender. It discusses genes and chromosomes, evolutionary psychology, behavior genetics, environmental influences on development, and the interaction of biological and social factors in gender development. The chapter examines theories of how children learn gender roles through social learning, reward/punishment, and acquiring cultural schemas of masculinity and femininity.
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Chapter 2
Where do we start? What is inherited from our parents and their ancestors and what role does environment contribute? These are but a few of the questions that this chapter will explore.
1
Heredity
DNA
Chromosomes
Genes
Meiosis
Mitosis
Heredity defines one’s nature – which based on the biological transmission of traits and characteristics from one generation to another. The structures we inherit both make our behaviors possible and places limits on them.
Genetic (inherited) influences are fundamental in the transmission of physical traits, such as height, hair texture, and eye color. Genetics also appears to be a factor in intelligence and in the origins of personality traits such as activity level, sociability, shyness, fearfulness etc. Genetic influences are also implicated in psychological problems and disorders such as anxiety and depression, dependence on nicotine and alcohol etc.
Chromosomes and genes – rod shaped structures found in cells. A normal human cell contains 46 chromosomes organized into 23 pairs. Each chromosome contains thousands of segments called genes. Genes carry the biochemical materials that regulate the development of traits. Polygenic – some traits are determined by the combination of pairs of genes.
We begin life as a single cell or zygote. There are 2 types of cell division.
Mitosis – cell division process by which growth occurs and tissues are replaced. Through mitosis, genetic code is carried into new cells in our bodies.
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Fertilization
Union of egg and sperm
Zygote
Union of egg and sperm - please note sperm with y sex chromosomes seem to swim faster then x one of the reason more boys are conceived then girls. Male fetuses suffer higher rate of spontaneous abortion usually during the first month of pregnancy. Boys also higher rate of infant mortality
The resulting fertilized egg is called a zygote.
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Male or Female
Autosomes
Twenty-third pair (sex chromosomes)
XX
XY
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Multiple Births
How they occur
Dizygotic twins
Monozygotic twins
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Dizygotic twins – two eggs fertilized by different sperm.
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