The genetics of PTC sensitivity and tongue rollingDownload
Activity and practice questions with answers
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The Genetics of PTC Tasting and Tongue Rolling
Link to CourseFlow ToolLink
Applied Strategy: Peer Instruction & Think-pair-share
Single class period (< 90 mins)
This activity examines readily detectable traits in humans: the variation in the ability to taste the chemical phenylthiocarbamide (PTC) and to exhibit tongue rolling.
Using self generated data and related questions, students will explore Mendel's principles of inheritance and variation within populations. PTC testing facilitates discussion about the phenotypic differences due to the single nucleotide polymorphisms (SNPs). Students will review Mendelian inheritance, genetic variation such as SNPs and other gene mutations and human pedigrees. Student PTC data is used for a population genetics exercise using the Hardy-Weinberg Model.
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