A couple has four children. All four siblings share the same two parents, but they differ in eye color, hair texture, and whether they can roll their tongues.

Two fields are planted with corn seeds from the same inbred line (genetically very similar).

A scientist grows a large population of bacteria that all came from the same original cell.

A horticulture class grows two groups of the same flower species:

A biology class is reviewing different events that can change DNA or the combination of alleles in humans.

Two healthy parents with no known family history of a certain genetic disorder have a child diagnosed with the disorder.