Population

Definition

A population is a group of individuals of the same species that live in the same area and interbreed. Populations are the basic units of evolution and ecology, as they interact with their environment and undergo genetic changes over time.

5 Must Know Facts For Your Next Test

1. Populations can be described by their size, density, distribution, age structure, and sex ratio.
2. The growth rate of a population is influenced by birth rates, death rates, immigration, and emigration.
3. Population density refers to the number of individuals per unit area or volume.
4. Carrying capacity is the maximum number of individuals that an environment can sustainably support without degrading.
5. Genetic variation within a population is crucial for natural selection and adaptation to changing environments.

Review Questions

• What factors contribute to changes in population size?
• How does carrying capacity affect population growth?
• What role does genetic variation play in the evolution of populations?

Related terms

species:

A group of organisms that can interbreed and produce fertile offspring.

ecosystem:

A community of living organisms interacting with their physical environment.

carrying_capacity: The maximum number of individuals an environment can support without degradation.