Final answer:
Polygyny is the most common mating system observed among primates, where one male mates with multiple females.
Step-by-step explanation:
The Most Common Mating System in Primates
The most common mating system practiced by primates is polygyny, where one male mates with multiple females. In this system, a dominant male, or alpha male, will have exclusive access to a group of females. This can be seen in species like gorillas and baboons.
While other mating systems like monogamy (where one male mates with one female) and polyandry (where one female mates with multiple males) exist in some primate species, polygyny is the most commonly observed among primates.
Learn more about Primate mating systems