有关被子植物果实各部分染色体数目和基因型的问题,是考试的热点,同学们在解决这一类问题时往往感到棘手.下面对这一知识点进行剖析,供参考.首先应弄清果实种子的形成.被子植物双受精以后,植物花的各部分发生了很大变化,一般是花萼、花冠、雄蕊以及雌蕊的柱头逐渐凋萎,雌蕊的子 The questions about the chromosome number and genotype of various parts of fruit of angiosperms are hot topics for the students. Students often find it difficult to solve this type of problem. The following analysis of this knowledge point is provided for reference. The fruit should be clarified first. The formation of seeds. After double fertilization of angiosperms, various parts of the plant flower have undergone great changes. Generally, the stigmas of the calyx, corolla, stamen, and pistil gradually wither, and the pistil