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15 terms

Bio 30 Chapter 21-23

Review for these chapters
STUDY
PLAY
Genetic Drift
The gradual changes in gene frequencies in a population due to random events
Gene Flow
exchange of genes between populations
Mutations
changes in the genetic material
Natural Selection
a natural process resulting in the evolution of organisms best adapted to the environment
Non-Random Mating
selection of mates with preferred phenotypes
Symbiosis
relationship in which two species live closely together
Mutualism
symbiotic relationship in which both species benefit from the relationship
Commensialism
When one member benefits from another and the other is neither benefitted or harmed.
Parasitisism
relationship that benefits one species and harms the other
Natality
the ratio of live births in an area to the population of that area
Mortality
the ratio of deaths in an area to the population of that area
Growth Rate
the rate of increase in size per unit time
Pedation
Interaction between organism in which one consumes another, leads to species adaptations: jellyfish
Density-Dependent Factor
limiting factor that depends on population size
Density-Independent Factor
limiting factor that affects all populations in similar ways, regardless of population size