Where do new genetic variations come from? After a genetic variation exists, what would cause its frequency in the population increase until it was fairly common?
What will be an ideal response?
Answer: A good answer will include the following key points.
? New genetic variations can result from spontaneous mutations and chromosomal crossover during the production of sperm and eggs.
? According to the principle of natural selection, the fate of these genetic variations depends on the environment.
? Specifically, in a given species living in a particular environment, some individuals with a genetically influenced trait tend to be more successful than others in finding food, surviving the elements, and fending off enemies—and are therefore better at staying alive long enough to produce offspring.
? As a result, their genes will become more and more common in the population, having been "selected" by reproductive success.
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a. standard ultrasound b. maternal glucose test c. amniocentesis d. 4-D color ultrasound
Most research in social psychology is based on Western European and Northern American samples, though some research has also been conducted in other areas of the world. Based on what is known to date, it appears to be reasonably safe to generalize social psychological research findings to the vast majority of ____
a. people living in the U.S. who are Caucasian b. people living in the U.S. c. people living in Western nations d. people from all cultures in the world
As an adolescent, Marla was in a brief incestuous relationship with her brother. Her sister Rhonda was in a long-term incestuous relationship with their father. We can expect that ____
a. Rhonda was more psychologically damaged than Marla b. Rhonda's incestuous relationship was more mutually consensual than Marla's c. Marla was more psychologically damaged than Rhonda d. there were few negative psychological effects for either woman
Dr. Portillo is conducting a study in order to test a casual hypothesis. What type of study must she conduct?
A. An experiment B. A survey C. A naturalistic observation D. A case study