lifespan Flashcards
In terms of heredity what are the three gene combinations?
-Single gene-pair inheritance characteristic. A single pair of genes (two recessive genes or one recessive and one dominant gene).
-Sex-linked inheritance occurs when a characteristic is influenced by a gene on one of the sex chromosomes, most often the X chromosome.
-polygenic inheritance occurs when a characteristic is influenced by multiple genes. Most characteristics – e.g., height, weight, hair color, intelligence, and susceptibility to cancer – are polygenic.
What is a phenotype?
Observed characteristics which is a combination of nurture and nature, e.g. height.
What is a genotype?
Genetic inheritance?
Explain how height are a combination of genotype and phenotype.
well, heritability is the variability in phenotype(observed height, e.g. 6 feet), but say about 80 percent is due to genetics, and 20 percent is due to environment, e.g. good eats.
What is heritability?
which variability in phenotype in a given population is attributable to differences in genotype:
Explain heritability in intelligence
.7 for high economic families
but .1 for low economic families
explain critical and sensitive period in terms of environmental influence?
Critical period is a limited period of time when exposure to certain environmental events is necessary for development to occur.
sensitive period is usually longer than a critical period and is a period of time when it’s optimal (but not necessary) for certain environmental events to occur.
Explain by Bronfenbrenner’s ecological theory in terms of
-micro
-meso
-macro
-exo
chronosystem
-Microsystem is the child’s immediate environment and includes the child’s relationships with parents, siblings, friends, and others at home, school, and church.
-The mesosystem involves interactions between different microsystems in the child’s life. For example, open communication between a child’s parents and teachers provides consistency across both environments.
-exosystem It incorporates other formal and informal social structures. While not directly interacting with the child, the exosystem still influences the microsystems. e.g politics, finances, world events.
-macrosystem established society and culture in which the child is developing.
-Chronosystem is The chronosystem relates to shifts and transitions over the child’s lifetime.
e.g. environmental shifts.
What is fetal programming?
environmental events in utero during sensitive windows of development can have permanent and long-lasting effects.
e.g. undernutrition during prenatal development is predictive of an increased risk for coronary heart disease and type 2 diabetes in adulthood
What is the average genetic heritability for intelligence?
How does it change as we age?
-overall .5
.2 to start moves to .8 in adulthood and back to .6 as seniors
What is behaviour genetics?
it is the study of how genetics effects behavioral psychological traits.
What’s the deal with twin studies and equal environment assumption?
well monozygotic twins have a higher correlation for intelligence than fraternal. however, mono also have a more homogenous environment which kinda makes the twin studies invalid
What are the findings of adoption studies?
Higher correlation due to genetic than environmental influence.
What are twin adoption studies and why are they the best?
Well you can basically have the same genetic template raised in a separate environment to show the difference between nature vs. nurture.
What is the Genotype-Environment Correlation?
that a person’s genetic make-up not only affects a person’s characteristics directly but also indirectly by influencing the environments the person is exposed to.
What is Passive genotype-environment correlation?
children inherit genes from their parents that predispose them to have certain characteristics and are exposed to environments by their parents that support the development of those characteristics.
For example, the children of sociable parents are likely to be genetically predisposed to being sociable, and their parents will provide them with many opportunities to participate in social activities.
What is Evocative genotype-environment correlation?
-child’s genetic make-up evokes certain kinds of reactions from parents and other people that reinforce the child’s genetic make-up.
-A sociable child will react to others in ways that encourage them to respond to the child in socially reinforcing ways.
What is Active genotype-environment correlation?
niche-picking and occurs when children actively seek experiences that “fit” their genetic predispositions?
How do the three genotype-environment correlations changes over time?
When you are little you are passive then you get noticed then evocative then niche
Explain Gottesman reaction range and canalization?
Reaction range for certain traits that determine how people respond to environmental influences.
-canalization means that the range is limited regardless of environmental influences. eg. IQ
What is Dynamic Systems Theory (DST)?
In other words it’s complex
nature and nurture to be essential for development. It’s based on the assumption that development is not simply the result of physical maturation but, instead, “is a complex process that involves the interaction of biology, environment, how we control ourselves and interact with others, and how we think about, or represent, our experiences in our minds
What is epigenetics?
-the study of changes in organisms brought about by modification of gene expression rather than by alteration of the genetic code in the form of DNA.
-for example diet, environmental pollutants, and child abuse can all influence genetic expression.
As described by Scarr (1992), niche-picking refers to which of the following genotype-environment correlations?
A. evocative
B. passive
C. active
D. reciprocal
C. active