Lifespan Flashcards
The brain is about __ of its adult weight at birth, but __ of its adult weight by 24 months.
25%, 80%
Genotype
Genetic inheritance
Phenotype
Observed characteristics, which are due to a combination of heredity and environment
What are Rutter’s indicators aka the six family risk factors that predict childhood psychopathology?
o Severe marital discord o Low socioeconomic status o Overcrowding or large family size o Parental criminality o Maternal psychopathology o Placement of the child outside of the home
Canalization
Used to described characteristics in which genotype restricts phenotype to a small number of possible outcomes
Niche picking
Active genotype-environment correlation
o Occurs when children actively seek out experiences that are consistent with their genetic predispositions
E.g., children who are extroverted will seek out stimulating activities
-More important as child is more independent
Epigenesis
Relationship between genetic and environmental influences as bidirectional and ongoing
Critical Period
Specific, predetermined period of time during biological maturation when an organism is particularly sensitive to certain stimuli that can have either a positive or negative impact on development
Sensitive periods
Longer in duration and more flexible than critical periods, and they are not tied as closely to chronological age or maturational stage
Germinal period
1-2 weeks
Embryonic period
3-8 weeks
Fetal period
9 weeks to birth
Dominant gene disorder
Due to the inheritance of a single dominant gene from one parent, e.g., Huntington’s Disease
Recessive gene disorder
Due to the inheritance of recessive genes (one from each parent), e.g., PKU, Tay-Sachs, and Sickle-Cell
Phenylketonuria (PKU)
Lack an enzyme needed to metabolize phenylalanine, an amino acid found in milk, eggs, bread, and other foods
Down Syndrome
Autosomal disorder that is due to the presence of an extra 21st chromosome
Characterized by intellectual disability, retarded physical growth and motor development, distinctive physical features, and increased susceptibility to Alzheimer’s disease, Leukemia, and hear defects.
Some evidence that the risk for giving birth to a baby with Down syndrome increases as the mother’s age increases
Klinefelter Syndrome
Occurs in Males and due to the presence of two or more X chromosomes alone with a single Y chromosome
Symptoms include smaller than normal genitalia, development of breasts during puberty, long legs with a short trunk, infertility, and learning disabilities and behavioral problems
Turner Syndrome
Occurs in Females and due to the presence of a single X chromosome
Symptoms include dropping eyes, short stature, webbed neck and other physical features, retarded or absent development of secondary sex characteristics, hearing/vision problems, and learning disabilities
Prader-Willis Syndrome
Caused by a deletion on chromosome 15
Characterized by intellectual disability, delayed motor development, underdevelopment of sex organs, intense food cravings and obesity
Translocation
The transfer of a chromosome segment to another chromosome
Inversion
When a chromosome breaks in two places and the segment formed by the breaks inverts and reattaches to the chromosome
In humans, usually do not affect phenotype
Teratogens
Environmental agents that adversely affect prenatal development
When pregnant, cocaine increases the risk of what?
premature birth
miscarriage
stillbirth
Prenatal exposure to cocaine
SIDS, seizures, low birthweight
Irritable, difficult to soothe, h. reactive
Small head, heart, urinary tract
learning and behavioral issues