Final answer:
Reproductive isolation can indeed occur without genetic isolation, often through sympatric speciation, where organisms share the same habitat but develop different reproductive behaviors or schedules.
Step-by-step explanation:
The statement 'Reproductive isolation can occur without genetic isolation' is True. Reproductive isolation simply means that individuals from different species or populations cannot successfully mate with each other. This can happen without geographic separation, in a process known as sympatric speciation. For instance, if two populations develop different mating behaviors or timings (temporal isolation), they can become reproductively isolated while still sharing the same habitat. Even in the absence of a physical barrier, such reproductive isolation can reduce or prevent gene flow between the populations, but it does not necessarily imply immediate genetic isolation as gene flow may have occurred prior to the development of reproductive barriers.