Evolution
Genetic Variation in Populations
Mutation and remixing of the alleles after sexual reproduction produces new arrangements of genetic code which gets passed down to future generations
Evolution
Evolution is the change in the frequency of an inherited trait in a population over time
4 Mechanisms of Evolution
Mutation
Gene flow
Genetic Drift
Natural Selection
Potential Overproduction of Offsprings
Overproduction of offspring and competition for resources as factors that promote natural selection. There is competition for resources and not every individual will obtain enough to survive and reproduce.
Selective Pressure
Abiotic and biotic factors as selection pressures. eg:
Competition for food is one factor that is density-dependent, and it can cause birth rate to go down or death rate to go up.
Differential Survival and Reproduction
Some traits are adaptations to abiotic factors in the environment and others help an individual to respond to biotic factors.
Fitness means how well the individual is well adapted to the environment, and it will be able to survive and reproduce.