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(一)中学遗传学教学中的问题1.现有教材中实验材料的选择不太符合教学规律的要求,反映不出新的科学成就。例如,果蝇唾液腺细胞巨大染色体实验,其目的是观察巨大染色体,了解遗传物质的形态。我们认为该目的就值得商榷,因为果蝇唾液腺染色体是特化的染色体,是经过DNA分子多次内复制后形成的,它和正常的体细胞在有丝分裂过程中或性细胞在减数分裂过程中所形成的染色体在形态结构上有很大的差异,其形成机理
(A) of the problems in secondary school teaching of genetics 1. Existing materials in the choice of experimental materials do not meet the requirements of the law of teaching, reflecting no new scientific achievements. For example, Drosophila salivary gland cell giant chromosome experiments, its purpose is to observe the giant chromosomes, understand the genetic material morphology. We think this goal is questionable because the Drosophila salivary gland chromosomes are specialized chromosomes that are formed after repeated in vivo replication of the DNA molecule and are associated with normal somatic cells during mitosis or during sex meiosis The formation of chromosomes in the morphological structure are very different, the formation mechanism