18.3 natural selection Flashcards
1
Q
selection pressures definition
A
environmental factors that limit the population of a species
2
Q
gene pool definition
A
total number of all the alleles of all the genes of all the individuals within a particular population at a given time
3
Q
what are the factors that evolution by means of natural selection depends upon?
A
- organisms produce more offspring that can be supported by available supply of food, light, space etc.
- there is genetic variety within the population of all species
- a variety of phenotypes that selection operates against
4
Q
what is intraspecific competition?
A
competition between individuals of the same species
5
Q
what is interspecific competition?
A
competition between individuals of different species
