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By observing their own families, students study the genetic traits of tongue rolling, PTC sensitivity, earlobe attachment, and eye color. They determine the patterns of inheritance, and learn how diagrammatic pedigrees can be used to show the occurrence and appearance of genetic traits. Student instruction sheets may be photocopied, and sufficient test papers are included for use with at least 100 students and their families. CONTENTS: 400 Strips PTC test paper, 400 Strips control paper, 4 Student instruction photocopy masters, Teacher's guide.