Species close speciesA type of organism that is the basic unit of classification. Individuals of different species are not able to interbreed successfully. are extinct if there are no living ...

By developing an understanding of the range of variation that characterizes our species at the level of the individual, the population, and the species as a whole, students will be challenged to break ...

An individual’s environment can also cause variation. For example, human height is genetically controlled but actual height reached will depend on the nutrition available.

Why are the variable levels and patterns of genetic variation important? Knowledge about how traits vary can reveal the evolutionary dynamics that shape populations. Once researchers have ...