大豆籽粒蓝脐性状及其分离规律

控制大豆白花亲本籽粒脐色的基因有带Ｒ与ｒ之分，带Ｒ基因的白花产本与紫花亲本杂交，Ｆ１代籽料出现蓝脐性状，其基因型为Ｉ－Ｒ－Ｗ１－ｔｔ。当控制脐色的基因有两对相差时（Ｒ、ｒ；Ｗ１、ｗ１）Ｆ２代籽粒脐色分离蓝脐与无色脐之比为９∶７。

Characters of Blue Hilum of Soybean Seed and Law of It's Segregation

Some of white-flowered parents carry the R gene which controls its huilum colour, others do not carry the R gene.When the white flowered parent carrying the R gene is crossed with the purple-flowered,all the seeds of the F_1 generation will be of the blue hilum, and its genotype is the I_R_W_1_tt.When the white-flowered parent not carrying the R gene is crossed with the purple-flowered parent,all the seeds of the F_1 generation will be of the colourless hilum,and its genotype is the I_rr W_1_tt.The appearence of the blue hilum of the seed in the Fl generation is not affected by the combining ways of the reciprocal crosses between the purple-flowered and white-flowered parents.The blue hilum character is controlled by pairs of genes.The segregational proportion of the hilum colour of the seeds in the F_2 generation is in accordance with the law of independent assortment. When two pairs of genes among all pairs of genes which control various colour of the hilum are not the same,the segregational proportion of the blue and colourless hilum will be 9:7.