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The use of the internet and smartphones in learning is binding because of its function which provides various learning resources. This study aims to determine the role of the internet as a learning resource for students on mastery of concepts, using a correlation design with correlational statistical tests to describe and measure the degree of association between two variables, namely the prospective duration of the online teacher and the acquisition of concepts. The subjects of this study were semester 5 (five) students majoring in biology education totaling 99 people at one of the universities in West Java. The study was conducted on Genetic learning in mobile learning with Gen 21 cs application in 3 (three) Genetic lecture activities. The results showed that online duration correlated with mastery of concepts. The highest correlation with a correlation value of 0.37 in the third activity, with the value of the level of significance of the category is low, which means that besides the duration of online there are other things that contribute to mastery of the concept of students