Development Across the Life Span Flashcards
The scientific study of the changes that occur in people as they age, from conception until death
Human Development
Special Designs used in researching age-related changes:
Longitudinal Design: 1 group followed at diff times
Cross-sectional Design: several diff age groups at one time
Cross-sequential Design: combination of longitudinal & cross-sectional
Research design in which one participant
or group of participants is studied over a
long period of time
Longitudinal Design
Advantage: looking at real age-related changes (same indivs)
Disadvantage: lengthy amount of time, money, and effort, loss of participants (move away, lose interest, death)
Research design in which participants are
first studied by means of a cross-sectional
design but are also followed and assessed
longitudinally.
Cross-sequential design
Research design in which several different
participant age-groups are studied at one
particular point in time
Cross-sectional design
Advantages: quick, inexpensive, easier to accomplish
Disadvantages: individuals of different ages are being compared to one another. Differences between age groups are often a problem in developmental research
The impact on development occurring when a group of people share a common time period or common life experience.
Cohort effect
For example, having been born in the same time period or having gone through a specific historical event
together
Heredity, the influence of our inherited characteristics on our personality, physical growth, intellectual growth, and social interactions.
Nature
The influence of the environment on
personality, physical growth, intellectual growth, and social interactions.
Nurture
Includes parenting styles, physical surroundings, economic factors
All that people are and all that people become is the product of an interaction between ______
Nature (heredity) and nurture (environment)
A field of study in which researchers try to determine how much of
behavior is the result of genetic inheritance and how much is due to a person’s experiences.
Behavioral genetics
The science of heredity.
Genetics
Special molecule that contains the
genetic material of the organism
_______ is a very special kind of molecule (the smallest particle of a substance that still has all the properties of that substance). DNA consists of two very long sugar–phosphate strands, each linked together by certain chemical elements called ________ arranged in a particular pattern
Deoxyribonucleic Acid (DNA)
Amines or bases
Organic structures that contain the genetic codes for building the proteins that make up organic life (hair coloring, muscle, and skin, for example) and that control the life of each cell.
Amines
Section of DNA having the same arrangement of chemical elements.
Each section of DNA containing a certain sequence (ordering) of these amines is called a _____
Gene
These genes are located on rod-shaped structures called _______. Tightly wound strand of genetic material or DNA.
Found where?
Chromosomes
Found in the nucleus of a cell
Humans have a total of ___ chromosomes in each cell of their bodies
Exception?
46
Egg and sperm
23 chromosomes from mother’s egg
23 chromosomes from father’s sperm
Most characteristics are determined by 22 such pairs, called the ______.
The last (23rd) pair determines the ___ of the person. The two chromosomes of this pair are called the _______
Autosomes
Sex, sex chromosomes
XX:
XY:
XX: Female
XY: Male
Referring to a gene that actively controls the expression of a trait. A ________ will always be expressed in
the observable trait.
Dominant gene
Referring to a gene that only influences the expression of a trait when paired with an identical gene. These genes tend to recede, or fade, into the background when paired with a more dominant gene.
Recessive gene
Almost all traits are influenced by more than one pair of genes in a process called _____
Polygenic inheritance
Polygenic means “many genes.”
*Certain kinds of genes tend to group themselves with certain other genes (blond hair and blue eyes)
*Other genes are so equally dominant or equally recessive that they combine their traits in the organism (blond r, red hair r = strawberry blond)
Dominant gene disorders
*Only one parent needs to have the gene for the disorder to be passed on to offspring
Huntington’s disease: a breakdown in the neurons of the brain
Marfan’s syndrome: a connective tissue disorder
A breakdown in the neurons of the brain.
Dominant or recessive?
Huntington’s disease
Dominant
A connective tissue disorder.
Dominant or recessive?
Marfan’s syndrome
Dominant
Recessive gene disorders
Diseases carried by recessive genes are inherited when a child inherits
two recessive genes, one from each parent.
Cystic fibrosis
Sickle-cell anemia
Tay-Sachs disorder
Phenylketonuria (PKU)
A disease of the respiratory and digestive tracts.
Dominant or recessive?
Cystic fibrosis
Recessive
A blood disorder.
Dominant or recessive?
Sickle-cell anemia
Recessive
A fatal neurological disorder.
Dominant or recessive?
Tay-Sachs disorder
Recessive
A condition wherein infant is born without the ability to break down phenylalanine, an amino acid controlling coloring of the skin and hair. If levels of phenylalanine build up, brain damage can occur; if untreated, it can result in severe intellectual disabilities.
Dominant or recessive?
Phenylketonuria (PKU)
Recessive
Chromosome disorder
Down syndrome
Klinefelter syndrome
Turner syndrome
A disorder in which there is an extra chromosome in what would normally be the 21st pair.
Down syndrome
Symptoms commonly include the physical characteristics of almond-shaped, wide-set eyes, intellectual disability, and the increased risk of organ failure later in life.
There is an extra sex chromosome in the 23rd pair, in which the 23rd set of sex chromosomes is XXY, with the extra X producing a male with reduced masculine characteristics, enlarged breasts, obesity, and excessive height.
Klinefelter syndrome
Condition in which the 23rd pair is actually missing an X, so that the result is a lone X chromosome.
These females tend to be very short, infertile, and sexually underdeveloped.
Turner syndrome
The female sex cell, or egg.
Ovum
The male sex cell.
Sperm
The union of the ovum and sperm
Fertilization