The number of individuals that contribute to the populations gene pool.

 The population of a country broken down by gender and age group

 1. Clumped

2. Uniform

3. Random

• The increase of a population as it grows in an ideal environment
• J-shaped curve

 Maximum rate of increase per individual under ideal conditions

•  The maximum number of individuals an environment can support
• Represented by K

•  A population grows rapidly and levels off once carrying capacity is reached
• S-shaped curve

•  A limiting factor that depends on population size
• K selection
• Ex. disease, predation, competition, food

•  A limiting factor that affects all populations regardless of size
• R selection
• Ex. storm, drought, hurricane, fire

• High survival rate until late in life
• Ex. humans, large mammals
• Show parental care of young

• Reflects a fairly constant death rate at all ages
• Ex. small mammals, some birds, lizards

• Death rate is highest early in life
• Produce many offspring
• Ex. insects, fish, plants, fungi

The population of a country broken down by gender and age group