Final answer:
Allopolyploid organisms can be fertile due to the extra chromosomes that allow for normal meiosis, although it generally takes two generations for fertile hybrids to form.
Step-by-step explanation:
In an allopolyploid organism, interspecies hybrids are generally infertile due to the inability of chromosomes to pair during meiosis. This is because the chromosomes from the two different parent species do not match up properly. However, allopolyploidy can overcome this barrier. For example, when a normal gamete from one species fuses with a polyploid gamete from another species, viable offspring may be produced, but it usually requires two generations, or two reproductive acts, to produce a fertile allopolyploid hybrid.
These hybrids have extra sets of chromosomes, which may allow for normal meiosis and fertility in the new allopolyploid species.