Lifespan Flashcards
polygenic
influenced by multiple genes (height, weight, IQ, personality)
A dominant trait can be due to ____ or ____
HOMOzygous: both are the same (HH, hh)
—OR—
HETEROzygous: both different (Hh)
examples of homozygous traits due one single dominant gene (Hh)
brown eyes, dark hair, farsightedness
most common
examples of homozygous traits due to 2 recessive genes (hh)
green/hazel/blue eyes, blonde hair, nearsightedness
an alternative form of a gene is called ______
an allele
Rutter’s family risk factors for child psychopathology
severe marital discord low SES overcrowding/large family size parent criminality MATERNAL psychopathology child placed outside home
Kauai study (Werner) positive outcomes for high risk infants due to:
- fewer stressors following birth
- easy temperament = high social responsively, good communication skills, consistent eating/sleeping patterns
- stable caregiver support
canalization
genotype restricts phenotype to small number of outcomes
think “canal”
reaction range
status within the range depends on environmental factors
width of the range depends on genetic factors
genotype-environment correlations
- passive–> child inherits traits, parents provide environment to develop those traits
- evocative –> child’s genetic makeup “evokes” reactions from parents/others that reinforce it
- active –> “niche picking” == child actively seeks out experiences consistent with genetic predisposition
critical periods vs sensitive periods
critical = specific and predetermined (e.g., imprinting goslings) sensitive = longer, more flexible; not closely tied to age or maturation stage
prenatal development
0-2 weeks: germinal stage (zygote)
3-8 weeks: embryonic stage (major structural damage if exposed to teratogens)
9 weeks-birth: fetal stage
Dominant gene disorders
single dominant gene from one parent
Huntington’s
Recessive gene disorders
2 recessive genes PKU cystic fibrosis Tay-Sachs sickle-cell
chromosomal disorders
variation in number or structure of chromosomes
aneuploidy
not correct number of chromosomes
Down = extra 21st
Klinefelter = 2 or more X with single Y (XXY, XXXY, etc)
Turner = female with single X
chromosomal deletion
part of chromosome missing
Prader-Willi
translocation
segment of chromosome transfers to another chromosome
sometimes in Down extra 21 is elsewhere
inversion
segment of chromosome breaks in 2 places, inverts and reattaches
Fetal Alcohol Spectrum Disorder (FASD)
FAS: most severe form
less severe:
*ARND: neuro disorder (no physical signs)
*ARBD: physical signs only (birth defects)
maternal conditions affecting baby
Rubella: heart defects, blind, deaf, ID
CMV: ID, hearing/visual impairments
HIV/AIDS: 20-30% transmission at birth; >1% if antiretrovial Rx used (50% survive to age 10)
malnutrition: low folic acid = neural tube defects
age of prematurity
less than 37 weeks
birthweight survivability
3.3 lbs (1500g)
SGA (small for gestational age)
below 10 %ile
develops less than normal rate
increased risk for asphyxia at birth, respiratory disease, hypoglycemia, LD, ADHD
brain mass at birth
25% of adult weight
(80% by age 2)
full weight by age 16
development of cerebral cortex
almost completely undeveloped at birth
first few months: motor and sensory areas develop
prefrontal develops thru childhood, adolescence, into 20s
pattern of brain development
cephalocaudal: from head (cephalo) to tail (caudal)
proximodistal: from center (proximo) to extremities (distal)
brain starts to shrink after age ___
accelerated brain cell death after age ___
shrinks after age 30
cell death after age 60
order of brain cell atrophy
frontal parietal temporal occipital NEW NEURONS in hippocampus!
development of vision in infants
birth - soft focus
2-5 days after birth - faces
by 2 mos prefer mom’s face to other women
6 mos - acuity close to adult
depth perception - kinetic cues, then binocular cues, then pictorial cues
auditory localization
some localization after birth
2-4 mos localization disappears, then reappears
3 mos - prefer mom’s voice
Motor milestones (1-3 mos)
raise chin, turn head
by 3 mos plays with hands/fingers
objects to mouth
Motor milestones (4-6 mos)
rolls over
5 mos sits on lap, reaches/grasps
6 mos sits alone, stands with help
First teeth
5-9 months
Motor milestones (7-9 mos)
increased coordination
8-9 mos sits alone, crawling/creeping
Motor milestones (9-10 mos)
pulls up to stand
Motor milestones (10-12 mos)
stands alone, walks with help
12 mos first steps alone
Motor milestones (13-15 mos)
wide-based gait, walks alone
15 mos creeps up stairs, uses cup, scribbles
Motor milestones (16-24 mos)
18 mos runs clumsily, walks up stairs with hand held, uses spoon
24 mos up/down stairs alone, kicks ball, turns pages, 50% toilet during day
Motor milestones (25-48 mos)
30 mos jumps with both feet, good hand-finger coordination
36 mos rides trike, dresses/undresses, complete toiling
48 mos hand preference
Age of puberty
GROWTH SPURTS:
girls 11-12 y.o.
boys 13-14 y.o.
FULL STATURE:
girls 15 yo
boys 17 yo
assimilation vs accommodation
assimilation = incorporate a new schema into existing knowledge accommodation = modify existing schema to accommodate new knowledge (You accommodate a guest by modifying your home)
sensorimotor stage age?
0-2 yo
circular reactions
6 substages and ages
substage 1 (0-1 mo) Reflexive schemes substage 2 (1-4 mo) PRIMARY circular reactions --> repeat a pleasurable activity with BODY substage 3 (4-8 mo) SECONDARY circular reactions --> repeat pleasurable activity with OTHERS and OBJECTS substage 4 (8-12 mo) COORDINATED SECONDARY circular reactions --> combines secondary cr.'s into sequences substage 5 (12-18 mo) TERTIARY circular reactions --> deliberately varies action sequence to discover consequences substage 6 (18-24 mo) Mental Representation --> representational (symbolic) thought
When does object permanence start?
substage 4
Accomplishments of Sensorimotor stage
emergence of deferred imitation & make-believe play
beginning to understand causality
Preoperational stage age?
2-7
semiotic function
symbolic function
learns through symbol use
precausal (transductive) reasoning
incomplete understanding of cause/effect
ex: magical thinking, animism
egocentrism
cannot take another’s perspective
world centers on self
irreversibility
doesn’t know actions can be reversed