Variation

When individuals that survive produce more offspring, passing their genes to the next generation.

The idea that some individuals survive better than others because of their traits.

Variation that falls into separate categories with no values in between.
Examples include blood group (A, B, AB, O) and tongue rolling.

A pattern of DNA fragments that is unique to an individual and can be used for identification.

The process by which a cell copies its DNA before cell division so that each new cell receives the same genetic information.

The process of determining the exact order of DNA bases (A, T, C, G) in a DNA molecule.

Small differences in DNA sequences between individuals that make each person genetically unique.

An allele that is expressed in the phenotype when only one copy is present.