论文部分内容阅读
遗传与变异是生物的普遍特性 常常听到人们这样说:“这姑娘长得和她妈妈一个样”,“这小孙子真像他爷爷”。是的,生物在传宗接代中总是按照自己的模式产生后代。俗话说:“种瓜得瓜,种豆得豆,大象生小象,鸡蛋孵出来的是小鸡而绝不是别的”,这就是遗传。 所谓遗传,是指子代和亲代在形态结构和生理功能上的相似。人类不但正常体征可以一代代传递,甚至有些疾病也会从亲代传到子代。如1500年前就记述过血友病前后代相传的现象,这种疾病几千
Genetics and variation are the common features of biology. People often hear people say, “This girl looks like her mother.” “This little grandson really looks like his grandpa.” Yes, creatures always produce offspring according to their own moderation in the lineage. As the saying goes: “The seeds of melons, beans beans, elephants elephants, eggs hatched chicken is by no means anything else,” This is heredity. The so-called genetic, refers to the offspring and parents in the morphological structure and physiological function similarities. Not only the normal signs of human beings can be passed from generation to generation, even some diseases will be passed from generation to generation. As described before 1500 before and after the phenomenon of hemophilia, the phenomenon of thousands of this disease