孟德尔在杂交实验中曾用过豌豆种子颜色这一相对性状,种子的颜色是指从种皮透出的子叶的颜色。但日常提到的种子颜色,大部分都不是真正种子颜色而是种皮的颜色,由于种皮是属于种子的一部分,所以一般情况这样提也还可以,但在讨论遗传问题时就应从发生角度予以区分,否则就会出现实验与理论的出入。把种子颜色定为子叶的颜色,就说明种子颜色决定了该种子自身的基因型。种子和果皮分别是由珠被和子房壁发育来的,因而它们实质上是母体分离出来的一部分,其基因型与母体的体细胞是相同的,杂交不可能改变这部分的基因型,而只能改变由受精的卵细胞和极核发育来的胚和胚乳细胞之基因型。所以杂交当代结 Mendel had used the relative trait of pea seed color in hybridization experiments. The color of the seed refers to the color of the cotyledon that emerges from the seed coat. However, most of the color of seeds mentioned in daily life is not the color of the seed but the color of the seed coat. Since the seed coat is part of the seed, this is generally acceptable. However, when discussing genetic problems, Be distinguished, otherwise there will be experimental and theoretical discrepancies. The seed color as cotyledon color, shows that the seed color determines the seed’s own genotype. The seeds and pericarp are developed from the peritoneal and parietal walls, respectively, and thus they are essentially part of the mother’s body separated from each other by the same genotype as the mother’s somatic cell. Hybridization can not alter the genotype of this part, but only Can change the genotypes of embryos and endosperm cells developed from fertilized eggs and polar nuclei. So hybrid contemporary knot