Development Through the Lifespan
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Transcript Development Through the Lifespan
Genotypes and Phenotypes
Genotype
Phenotype
Genetic make-up
of an individual
Observable
characteristics of
an individual
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Genetic Foundations
Chromosomes – store and
transmit genetic
information
Genes – segments of DNA
located along the
chromosomes
DNA – substance of which
genes and chromosomes
are made.
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DNA and Mitosis
Mitosis-duplicate DNA with a
slight change
Meiosis- duplicate is exactly the
same-helps create genetic
diversity
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Chromosomes, Cells, and Sex:
Terminology-which person determines
the sex of a baby?
Autosomes
The 22 pairs of chromosomes that are
not sex chromosomes
• 23rd pair of chromosomes
Sex
• Determines sex
Chromosomes
• XX = female, XY = male
Gametes
Zygote
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Sex cells: Sperm and ova
Sperm and ovum united
Twins
Fraternal/Dizygotic
Two zygotes,
or fertilized ova
Identical/Monozygotic
One zygote that divides
into two individuals
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Alleles
Two forms of the same gene
Appear at the same place on both
chromosomes in a pair
One inherited from each parent
Homozygous - the two alleles are alike
Heterozygous - the alleles differ
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Dominant-Recessive Inheritance
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X-Linked Inheritance
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Incomplete Dominance and
Polygenetic Inheritance
Incomplete
Dominance
Both alleles of a single
gene are expressed
Results in
combined trait or
intermediate between the
two
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Polygenic
Inheritance
Many genes combine to
influence a trait
Genetic Imprinting
and Mutation
Imprinting
Mutation
Chemical marker
that activates
either father’s or
mother’s gene
Often temporary
Sudden,
permanent change
in a DNA segment
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Chromosomal Abnormalities
Down Syndrome
Problems with the 21st
chromosome
Sex Chromosome
Abnormalities
Problems with the X or Y
chromosomes
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Reproductive Choices
Genetic counseling
Prenatal diagnosis and
fetal medicine
Genetic testing
Adoption
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Reproductive Technologies
Donor Insemination
In Vitro Fertilization
Surrogate Mother
New Technologies
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Genetic Counseling
Helps couples:
Assess chances of hereditary disorders
Choose best course of action
Risks
Family goals
Recommended when:
Couple has had difficulties
Aware of genetic problems
Woman is over 35
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Prenatal Diagnostic Methods
Amniocentesis
Chorionic Villus Sampling
Fetoscopy
Ultrasound
Maternal Blood Analysis
Preimplantation Genetic Diagnosis
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Amniocentesis and
Chorionic Villus Sampling
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Adoption and Adjustment
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Environmental Contexts
for Development
Family
Socioeconomic Status and
Family Functioning
Affluence
Poverty
Neighborhoods, Towns
and Cities
Cultural Context
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Family Influences
on Development
Direct
Two-person relationships
Indirect
Third Parties
Adapting to Change
Changes from within
and outside the family
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Socioeconomic Status (SES)
Social Status
Years of education
Job prestige and skill required
Economic Status
Income
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Socioeconomic Status
and Family Functioning
Timing and duration of family
life cycle
Values and expectations
Father’s involvement
Communication and discipline
styles
Children’s cognitive
development
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Risks of Affluence
Alcohol and drug use
Anxiety
Depression
Unavailable parents
Overscheduled
Demanding
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The Importance of Regularly Eating
Dinner as a Family
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Who is Poor?
12% in U.S. and Canada
Parents under age 25 with young
children
Elderly living alone, especially
women
Ethnic Minorities
Women
Children
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Children in Poverty:
U.S. and Canada
60
50
40
30
20
10
0
All Children
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Native
American
African
American
Latino
Native
Canadian
Benefits of Strong Community Ties
for Children and Adults
Social interaction, activities
Cooperation to provide clean, safe
environment
Participation in important tasks
Mutual assistance
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Extended Families
Three or more generations living
together
More common in many minority
cultures
Benefits
Reduces stress of poverty
Assistance for all generations
Emotional bonds, support
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Individualist and
Collectivist Societies
Individualist
Collectivist
People define
People define
themselves as
themselves as part
separate from
of a group
other people
Stress group goals
Largely concerned
over individual
with personal
goals
needs and goals
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Poverty in Late Adulthood
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Indicators of Children’s
Health and Well-Being
U.S. Rank
Childhood Poverty
23
Canadian
Rank
16
Infant Death
26
16
Teen Pregnancy
28
21
Education Spending
10
6
Health Spending
16
4
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How Much Does Heredity
Contribute to Behavior?
Heritability
Estimates
Portion of individual
differences
attributable to
genetics
Ranges from
0 to 1.00
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Concordance
What percent of
the time do twins
both show a
trait?
Ranges from
0 to 100%
Range of Reaction
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Genetic-Environment Correlation
Passive Correlation
Evocative
Correlation
Active Correlation
Niche-picking
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The Epigenetic Framework
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