Final answer:
Approximately 85-90 percent of genetic variation exists within populations and is shared by all human populations, while the remaining 10-15 percent occurs between populations.
Step-by-step explanation:
Approximately 85-90 percent of genetic variation exists within populations and is shared by all human populations, while the remaining 10-15 percent occurs between populations. This means that most genetic differences are found within individuals of the same population, rather than between different populations. The high level of genetic diversity within human populations is a result of various factors such as mutation, recombination, and gene flow.