Variation

A traditional method where humans choose organisms with desirable traits and breed them over generations to produce offspring with those traits.

An environmental factor that affects which individuals survive and reproduce.

Examples include predators, disease, climate, or competition for food.

The pair of chromosomes that determine the biological sex of an individual.

Humans:

• XX = female

• XY = male

A characteristic controlled by a gene located on a sex chromosome, usually the X chromosome.

Short sequences of DNA that repeat several times in a row.
The number of repeats varies between individuals, making STRs useful for identification.

The process by which one species splits into two or more separate species over time.

The specific position on a chromosome where a short tandem repeat is located.

The idea that organisms best adapted to their environment are more likely to survive and reproduce, passing their genes to offspring.

Development that meets current needs without damaging the environment or limiting resources for future generations.