Developmental psychology
the study of the normal changes in behavior that occur across the lifespan
heredity (“nature”)
the transmission of physical and psychological characteristics from parents to offspring through genes
deoxyribonucleic acid (DNA)
a molecular structure that contains coded genetic information
chromosomes
rodlike structures in the cell nucleus that house an individual’s genes
genes
areas on a strand of DNA that carry hereditary information
genetic disorders
problems caused by defects in the genes or by inherited characteristics
dominant gene
a gone whose influence will be expressed each time that the genes is present
recessive gene
A gene whose influence will be expressed only when it is paired with a second recessive gene of the same type
polygenic characteristics
personal traits or physical properties that are influenced by many genes working in combination
maturation
the physical growth and development of the body, brain, and nervous system
environment (“nurture”)
the sum of all external conditions affecting development, including especially the effects of learning
teratogen
a harmful substance that can cause birth defects
congenital problems
defects that originate during prenatal development in the womb
petal alcohol spectrum disorder (FASD)
a collection of conditions occurring in children whose mothers consumed alcohol during pregnancy
temperament
general pattern of attention, arousal, and mood that is evident from birth
developmental level
an individual’s current state of physical, emotional, and intellectual development
readiness
a condition that exists when maturation has advanced enough to allow the rapid acquisition of a particular skill
sensitive period
during development, a period of increased sensitivity to environmental influences. It is also a time during which certain events must take place for normal development to occur
deprivation
in development, the loss or withholding or normal stimulation, nutrition, comport, love, and so forth; a condition of absence
enrichment
in development, deliberately making an environment more stimulating, nutritional, comforting, loving, and so forth
adolescence
the culturally define period between childhood and adulthood
emerging adulthood
a socially accepted period of extended adolescence that is now quite common in Western and Westernized societies
subjective well-being
general life satisfaction combined with frequent positive emotions and relatively few negative emotions
ageism
stereotyping, prejudice, and discrimination directed against someone based solely on their age