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Developmental Psych
Chapter 2 - Biological and Environmental Foundations
Question | Answer |
---|---|
Phenotypes | Directly observable characteristics. Determined by relationship between ALLELES. |
Genotype | Genetic information that determines our species and influences all our unique characteristics |
Nature vs Nurture | Both nature and nurture affect all aspects of development |
Chromosomes | Rodlike structures which store and transmit genetic information. Human chromosomes comes in 23 matching pairs (22 of which are called AUTOSOMES. 23rd is the SEX CHROMOSOMES). Comprised of DNA |
DNA | Body cells which reproduce by mitosis (duplicate). Consists of pairs of matching chemicals called bases. 98.99% of chimpanzee & human DNA is identical |
Gene | Segment of DNA along the length of the chromosome |
Mitosis | Duplication of DNA |
Gametes | Sex cells – sperm and ovum |
Meiosis | Process of cell division where gametes are formed. Halves the number of chromosomes normally present. MEN – 4 sperm produced; can produce for life. WOMEN – 1 ovum produced; material to produce degenerates; born with all ova |
Cytoplasm | Area surrounding the cell nucleus |
Zygote | Fertilized ovum with 46 chromosomes (23 from sperm, 23 from ovum) |
Crossing over | Exchange of genes of chromosomes next to each other. |
Allele | Each of 2 forms of a gene located at the same place on the autosomes. 2 same = homozygous; 2 different = heterozygous |
Dominant-Recessive Inheritance | 1 dominant, 1 recessive allele. Trait of dominant allele is visible and becomes carrier for recessive allele |
Modifier Genes | Enhance or dilute the effects of other genes. |
Incomplete Dominance | Both alleles are expressed; either intermediate between 2 or both combined |
X-Linked Inheritance | Males more likely because of unmatched chromosomes. On females, any recessive allele on one X has a good chance of being suppressed by dominant allele on other X. EG hemophilia |
Genetic Imprinting | Allele are marked in such a way that it is activated regardless of makeup |
Mutation | Sudden, permanent change in DNA. GERMLINE MUTATION – occurs in cells that develop in to gametes; passes to next generation. SOMATIC MUTATION – occurs at any time to normal body cells |
Polygenetic Inheritance | Many genes affect a characteristic |
Chromosomal Abnormalities or Defects | Most occur during meiosis (sperm & ovum formed) +/- X chromosomes = mental defects 0EG Down Syndrome most common; Klinefelter’s Syndrome (XXY; XYY Syndrome; Turner’s Syndrome (XO); Fragile X Syndrome; |
Dominant Recessive Diseases | People with serious diseases due to dominant alleles rarely live long enough to reproduce, eliminating allele from family heredity (Hungtington’s is an exception) EG Sickle cell anemia, PKU |
Down Syndrome | Most common chromosomal defect. 21st pair fails to separate during meiosis or extra on 21 (Trisomy 21). SYMP gap between 1st & 2nd toes, mental retardation, speech, stocky, short build, flattened face, almond-shaped eyes. Risk rises with maternal age |
Genetic Counseling | Process designed to help couples asses chances of giving birth to a baby with a disorder and choose best course of action EG women past 35, repeated miscarriages, known genetic problems |
Prenatal Diagnostic Methods | Medical procedures that permit detection of developmental problems before birth. EG ultrasound, amniocentesis, fetoscopy |
Socio-Economic Status (SES) | Measure of family’s social position and economic well-being that combines 3 related variables: years of education, prestige of skill required by job, income. Higher SES = enhanced cognitive and language dev. w |
Extended Family Households | Parent and child live with one or more adult relatives |
Collectivist Societies | Societies in which people define themselves as part of a group and stress group over individual goals. Value interdependent self – stresses social harmony, obligations & responsibility to others and collaborative endeavors |
Individualistic Societies | Societies in which people think of themselves as separate entities and are largely concerned with their own personal needs. Value independent self – emphasizes personal exploration, discovery and achievement and individual choice in relationships |
Public Policies | Laws and government programs designed to improve current conditions |
Convention on the Rights of the Child | Legal agreement among nations that commits them to work toward guaranteeing environments that foster child’s development, protection and enhancement of community participation and self-determination |
Behaviorual Genetics | Field devoted to uncovering contributions of nature and nuture |
Heritability Estimates | Measures the extent to which individual differences in complex traits in a specific population are due to genetics. Obtained from KINSHIP STUDIES – comparing characteristics of family member |
Concordance Rate | Percentage of instances in which both twins show a trait when it is present in one twin |
Range of Reaction or Reaction Range | Genetically determined response to a range of environmental conditions |
Canalization | Genetically determined restriction of development to 1 or a few possible outcomes. EG language development |
Genetic-Environmental Correlation | Idea that heredity influences the environments to which we are exposed. PASSIVE –child has no control over it. EVOCATIVE – responses children evoke from others influenced by child’s heredity, and these responses strengthen the child’s original style |
Niche-Picking | Tendency to actively choose environments that complement our heredity. EG Child choosing to spend time practicing piano |
Epigenesis | Development resulting from ongoing, bi-direction exchanges between heredity and all levels of environment |