Final answer:
The single origin hypothesis suggests that modern humans originated from a single population of ancestors in Africa and then migrated to replace other hominin populations. This hypothesis is supported by genetic evidence.
Step-by-step explanation:
The single origin hypothesis, also referred to as the replacement hypothesis, proposes that modern humans originated from a single population of ancestors in Africa. This hypothesis suggests that these early humans then migrated and replaced other hominin populations across the globe. Proponents of the single origin hypothesis argue that it is supported by genetic evidence, such as the higher genetic diversity found in African populations compared to other populations.