十月怀胎,一朝分娩。一个小小的单细胞受精卵,何以能长成亿万细胞,包括多个系统、脏器的个人呢?这是一个既古老又神秘的科学难题,也是自然界的一大奇迹。一个细胞分裂、变成两个一模一样的细胞,这种现象相对易懂,这是细菌等单细胞的低等生物的繁殖模式;然而,从一个细胞开始,逐渐生长出一群细胞,最终有的变成血细胞、有的变成骨细胞、有的变成毛发细胞,组成一个复杂而又精密的人体,这实在令人惊叹不已。目前,科学家正在探寻这生命发展之谜,以深入地研究先天缺陷的病因、不育症,并找出有效的治疗方法。科学家发现,人的细胞都从受精卵发育而来,因此所有的细胞都含有完全相同的一套基因,之所以日后有的变成血,有的长成肉,有的成为骨,是取决于细胞中一套独特的基因,这套基因并不在“制 Pregnancy in October, once childbirth. How can a small single-caged egg grow into hundreds of millions of cells, including multiple systems and organs? This is an ancient and mysterious science problem and a miracle in nature. A cell divides into two identical cells, a phenomenon that is relatively easy to understand. This is the mode of reproduction of lower organisms such as bacteria, but from the beginning of a cell, a group of cells gradually grow up, eventually changing Into the blood cells, and some become osteoblasts, and some become hair cells, forming a complex and sophisticated body, which is really amazing. At present, scientists are exploring the mystery of this development of life, in-depth study of the causes of birth defects, infertility, and find effective treatment. Scientists have found that human cells are derived from fertilized eggs, so all cells contain exactly one set of genes. Some of them become blood later, some grow into flesh, and some become bone, depending on the A unique set of genes in cells, this gene is not in the ”system