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Abstract

Students have difficulties understanding the crossing-over field concept in genetic courses because within the concept of crossing-over there are facts and problems that are difficult to solve as well as the absence of valid, practical, and effective student worksheets. So that the learning process is complete, activities and student learning outcomes become low. The purpose of this research is to develop a student worksheet based on mastery learning that is valid, practical, and effective on crossing-over field concept. The type of research is developed using 4-D model. The data analysis technique is a descriptive analysis that describes the results of validity, practicality, and effectiveness of the student worksheet. The result of the validity test and the practicality of student worksheet based on mastery learning on crossing-over field concept is a validity value of 88% and practical value of 80,24%. This student worksheet is used because it can increase student activity and learning outcomes.

Keywords: development, student worksheet, mastery learning, crossing-over

Received 19 Oct., 2017

Revised 31 Dec., 2017

Contents

. Abstract

. Introduction

. Methods

. Results and discussion

. Conclusion

. References

Introduction

Genetics is one of the compulsory subjects of every student of Biology education at STKIP PGRI Sumatera Barat in semester five. Genetics is one of the subjects of sciences and skills in the field of Biology. The genetics subject has a code BIO 10024 with a weight of 3 credits. Genetics is part of the science of Biology that requires the ability to think creatively in solving various problems in society (Susantini et al., 2016). The purpose of this subject is that students of the biology education department in STKIP PGRI Sumatera Barat have knowledge in the basics of Mendel genetics, introduction to modern genetics and are able to apply the science of genetics in everyday life. But in reality, there are still many students who do not master the concepts in the subject of genetics, especially the crossing-over field concept.

Many students regard the crossing-over field concept as difficult as the crossing-over field concepts are facts and problems that are difficult to solve, and there is an absence of valid, practical, and effective student worksheets. The concern is the learning process is complete, activities and student learning outcomes...

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