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遗传和变异是生命的基本特征之一。任何生物都是通过新陈代谢进行生长、发育和繁殖的,而在这些生命活动过程中,发生着性状的遗传和变异。遗传和变异是生命运动中的一对矛盾,这对矛盾的不断运动,经过自然选择,就形成了生物界中形形色色的物种;同时,经过人工选择,就培育出适合人类生产和生活需要的各种品种。所以,使学生获得生物遗传和变异方面的知识,对于他们认识生命的本质和生物进化,是十分必要的。生物的遗传和变异是有其物质基础的,是由遗传物质控制的,通过本节课的教学,应该使学生了解DNA是主要的遗传物质;染色体则是DNA的主要载体,从而为进
Genetics and mutation are one of the basic characteristics of life. Any organism grows, develops and reproduces through metabolism, and in these life activities, the inheritance and variation of traits occur. Genetics and mutation are a pair of contradictions in the life movement, and this continuous movement of contradictions leads to all kinds of creatures in the biological world through natural selection. At the same time, after artificial selection, we have cultivated various Variety. Therefore, to enable students to acquire knowledge of biological inheritance and variation is very necessary for their understanding of the essence of life and the evolution of biology. Biological genetics and mutation have their material basis and are controlled by genetic material. Through the teaching of this lesson, students should understand that DNA is the major genetic material. Chromosomes are the main carrier of DNA, so as to improve