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.
You might also like to view...
Cherilyn's parents often ignore her emotions or try to explain that her problems should not upset her. Cherilyn's parents can be described as ______.
A. emotion-coaching. B. emotion-dismissing. C. emotion-attending. D. emotion-scaffolding.
Bryoni's mother has rearranged the living room to create a study corner for her, with a desk, computer table, and bookcase. It is likely that Bryoni
A) sets a high priority on schoolwork and achievement. B) feels pressured by this arrangement. C) resents being singled out in this way. D) studied better sitting on the floor in front of the TV.