Genetic studies have suggested interbreeding between the yayoi and jomon people , with the jomon contribution to modern japanese being as much as 40 percent .
基因研究显示了弥生人和文人之间的杂交,文人对现代日本基因的贡献有40%之多。
If that ice is scattered in random patches throughout the arctic ocean , polar-bear populations could be expected to vanish , either through loss of habitat or from interbreeding with other , related bears .