八年级生物下册7-2-5生物的变异教案2新版新人教版

difficulties and didn’t lose heart and made an attempt 5_________(find) another job. It was h is friend Mr Smith6________helpe d him out.7_______(eventua l)he got a 8_________(good)job than ever before.Without Mr S mith,he wo uld be in trouble no He has made up his mind 9_______(do)whatever he can 10________ return for his help in the future.

第五节生物的变异

、举例说出可遗传的变异和不遗传的变异，并能说出引起两种变异的原因。

、运用所学知识解释调查结果的能力。

的，并且变异产生的原因是多方面的，既有遗传物质方面的原因，也有环境的原因。

difficulties and didn’t lose heart and made an attempt 5_________(find) another job. It was h is friend Mr Smith6________helpe d him out.7_______(eventua l)he got a 8_________(good)job than ever before.Without Mr S mith,he wo uld be in trouble no He has made up his mind 9_______(do)whatever he can 10________ return for his help in the future.

交流后，再组织全班进行叙述，初步认识变异现象。

颜色的性状不同；三只安康羊同属一个物种，但—只有角，另两只无角；二只果蝇同

“为什么生物的变异是普遍存在的

包括提出问题、作出假设、制定并实施探究计划、完善计划、分析结果并得出结论几

difficulties and didn’t lose heart and made an attempt 5_________(find) another job. It was h is friend Mr Smith6________helpe d him out.7_______(eventua l)he got a 8_________(good)job than ever before.Without Mr S mith,he wo uld be in trouble no He has made up his mind 9_______(do)whatever he can 10________ return for his help in the future.

．提出问题：各小组可以提出自己的问题进行探究。如：同是花生这个物种大花生的长轴大小

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