The movement of genes into or out of a population.

In small populations, individuals that carry a particular allele may leave more descendants than other individuals, just by chance

A change in allele frequency following a dramatic reduction in the size of a population (like a catastrophe)

Change in allele frequencies as a result of the migration of a small subgroup of a population

the differences in characteristics between organisms

A change in a gene or chromosome.

alternative form of a gene

PHysical traits of an organism

genetic makeup of an organism; an organism's combination of alleles

variation of a particular inherited character

The process of forming a new species.

Ability of bacteria or to resist the effects of an antibiotic

Change in a population over time.

The process by which organisms in nature with variations most suited to their local environment survive and leave more offspring.

Describes how well an organism can survive and reproduce in its environment

Any heritable characteristic that increases an organism's ability to survive and reproduce in its environment

drug developed in order to treat bacterial diseases (strep, pneumonia, food poisoning & tuberculosis)

when unwanted organisms develop resistance to the methods humans use to kill them

causes pests and weeds to often develop resistance to pesticides in the same way that bacteria develop resistance to antibiotics