The top row shows variation in a zooplankton, Daphnia: the morph on the right is produced in the presence of a predator cue. The second row shows an example of dimorphic variation in horn length, ...

Variation is the differences between individuals of the same species, caused by genetic and environmental factors. Surveys into variation give data that are continuous, which means to come in a range, ...

Marked geographic patterns for the distribution of some heritable traits are observed in humans, including traits related to disease risk, pathogen resistance and drug response. In some cases, the ...

A characteristic of any species with only a limited number of possible values shows discontinuous variation. Here are some examples: For any species a characteristic that changes gradually over a ...