无籽西瓜是三倍体 ,由于它的染色体配对发生了紊乱 ,从而不能正常地进行减数分裂。在分裂前期 ,每种染色体有三个 ,组成三价体 (三个染色体连在一起 ) ,或者组成二价体 (二个染色体连在一起 )和单价体 (一个染色体单独存在 )。在分裂后期 ,二价体分离正常 ,但三价体一般是两个 Seedless watermelon is a triploid, due to its chromosomal pairing disorders, which can not be normal meiosis. In the early stages of division, there are three for each chromosome, consisting of the triad (the three chromosomes are linked together), or the diva (consisting of two chromosomes together) and the monovalent (one chromosome alone). In the later period of division, the divalent body separates normally, but the trivalent body is generally two