And the odds decrease still more when crosses between unrelated genera are tried.
And the odds decrease still more when crosses between unrelated genera are tried.
如卡特兰和兜兰，就像马和牛一样，因为遗传隔离太大而不可能产生后代。
And the odds decrease still more when crosses between unrelated genera are tried.
如卡特兰和兜兰，就像马和牛一样，因为遗传隔离太大而不可能产生后代。