TAMU PSYC 307 - Biological Backgrounds of Developmental Psychology (4 pages)

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Biological Backgrounds of Developmental Psychology



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Biological Backgrounds of Developmental Psychology

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This lecture goes through the biological backgrounds and bases for developmental psychology and genetics.


Lecture number:
3
Pages:
4
Type:
Lecture Note
School:
Texas A&M University
Course:
Psyc 307 - Developmntl Psychology
Edition:
1
Documents in this Packet

Unformatted text preview:

PSYC 307 1st Edition Le cture 3 Overview of Previous Lecture I Research Methods Overview of Current Lecture II Biological Backgrounds a Interplay of Heredity and Environment b Alleles c Model of Interaction d Behavior Genetics e Prenatal Development Current Lecture Biological Backgrounds I Interplay of Heredity and Environment i Influences individual s character b Basic Genetics Principles i Two kinds of cells 1 Somatic body cells 23 pairs of chromosomes a Cell division by mitosis b 23rd pair sex chromosomes determine gender c Genes segments of chromosomes units of heredity 2 Gametes sex cells sperm ovum 23 single chromosomes a Cell division by meiosis b When cells divide they split chromosome pairs into singles c Twinning i Identical monozygotic share the same DNA one fertilized egg splits into two ii Fraternal dizygotic two separate eggs are fertilized different DNA 1 Fraternal twins share 50 of their genetic material a Same as siblings born at different times iii Half identical one egg two different sperm 1 The egg splits after fertilization 2 Most rare of the types of twinning iv Other factors effecting twinning 1 Ethnic factors twins occur the most frequently in whites less frequently in blacks least frequently in Asians 2 Incidence of twins in relation to age women between the ages of 35 and 39 have the highest likelihood to give birth to twins 3 Nutrition and body type women with small slight builds are less likely to have twins women with poor nutrition and diet are less likely to have twins d Mechanisms and Genetic Diversity i Mutations irregularities in genes ii Random Assortment cells split randomly no set structure to cell division iii Cross over parts of chromosomes or DNA can break off and attach somewhere else or to a different piece of genetic material entirely II Alleles i Two forms of alleles 1 Dominant expressed only one dominant allele needed for the trait to be expressed 2 Recessive only expressed if two recessive alleles are present a Can be a



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