Final answer:
The three mating systems that emerge from different operational sex ratios are monogamous, where one male pairs with one female; polygynous, where one male mates with several females; and polyandrous, where one female mates with multiple males.
Step-by-step explanation:
The three types of mating systems that can form from different operational sex ratios are monogamous, polygynous, and polyandrous. In monogamous systems, one male and one female mate with each other exclusively for at least one breeding season, and often longer. This can be advantageous in ensuring parental care and protecting against competition for mates. In polygynous systems, a single male mates with multiple females. This can occur in resource-based scenarios, harem structures, or lek systems, resulting in the male not being able to provide parental care for the offspring. And in a polyandrous system, one female mates with multiple males. This system is less common but may occur where females control valuable resources, thus attracting multiple suitors.