According to Ask a Scientist... Cultivated bananas are parthenocarpic (with sterile fruit), while wildbananas did have seeds. The fruit was probably a result of co-evolution with its pollinators and the animals that feed upon it and spread its seeds before cultivated forms. Further, the site states ""The banana (Musa accuminata) is a berry formed from a superior ovary of three joined carpels arranged in an axile placentation. The flowers are born on long and pendulous inflorescence which are usually unisexual, that is, the female flowers are born near to the base of the peduncle (producing the typical banana berry fruits) while the male flowers are born on the tip of the same peduncle. Seed may be produced or more usually, develop the berry parthenocarpically. Both the seeded and the parthenocarpic berry are very similar in structure when flowering."