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A:首先我们得了解一下基因型、等位基因。基因型指决定生物某一性状的基因组合,广义来讲是指某一个体全部基因组合的总和。等位基因是指在同源染色体上控制相对性状的不同基因。因此问题应该这么问:“为什么一对夫妇所生的几个孩子基因型会不一样?”这就要从人类生殖细胞的分裂说起。在减数分裂后形成的细胞中,染色体数和基因数量都会减半,故名减数分裂,叉可分为减数第一次分裂和减数第二次分裂。
A: First of all, we have to understand the genotype, allele. Genotype refers to the combination of genes that determine a certain trait of a creature, in the broad sense refers to the sum of all the genomes of an individual. Alleles are different genes that control relative traits on homologous chromosomes. So the question should be asked: “Why are the genotypes of several children born to a couple different?” "It starts with the division of human germ cells. In meiosis after the formation of cells, the number of chromosomes and genes will be halved, hence the name meiosis, fork can be divided into first and second meiosis division.