Lesson 5 Flashcards
How does artificial selection differ from natural selection?
Artificial selection is human intervened for the production of traits beneficial to us.
What is evolutionary fitness?
An individual’s lifetime reproductive success relative to that of others in the population.
Does selection pressure act on the geneotype or phenotype?
Phenotype.
How does the size of the gene pool act to limit change occurred through artificial or natural selection?
Change is dependent on the genetic variation present in a population at a given time.
What is stabilizing selection?
Selection against the extremes of a population, narrowing variation.
What is directional selection?
Selection against one extreme, but in favour another, shifting the mean.
What is disruptive section?
Selection against the mean, producing further extremes.
Why are certain traits sexually selected?
They are often indicators of a male’s health or overall quality as a mate.
What is sexual dimorphism?
The distinct presence of secondary sexual characteristics and other non genitalia based physical differences.
When is sexual dimorphism more likely to be present?
When there are higher levels of completion for mates amongst members of the same sex.
