Intro to Genetics Lab: Class Phenotype Inventory and Mendelian Traits

This intro to genetics lab is the perfect way to launch your heredity and genetics unit. Students survey and take inventory of five visible human traits (earlobes, dimples, hitchhiker’s thumb, widow’s peak, and tongue rolling), record class data, create graphs, and analyze patterns.

No prior knowledge is needed, making it an easy and engaging first-day activity.

As part of the genetics lab, students practice turning their data into fractions and ratios and then compare their results to Mendelian expectations. This process builds curiosity about heredity while highlighting why real human data doesn’t always show a perfect 3:1 ratio—making it the perfect springboard into Mendel’s work.

Everything you need is included: a projectable genetics presentation with pictures of each phenotype, an editable version, a PDF version, and a Google Slides version of the student handout, and a complete teacher genetics lesson plan with standards, step-by-step procedures, and teaching tips.

❤️ Why Teachers Love This Genetics Activity:

• No-prep, ready-to-use genetics activity with clear student handouts
• Presentation with clear pictures of dominant and recessive phenotypes
• Engaging first-day inquiry activity — no prior knowledge needed
• Teacher guide with step-by-step teaching procedure, directions, and teacher tips
• Flexible for any class size

By the end of this intro to genetics lab, your students will have graphed and compared class traits, discovered why ratios matter in heredity, and built curiosity to learn about genes, alleles, and Punnett squares.

Save time and money: This resource is included in my growing Genetics and Heredity Bundle – on sale now!

Intro to Genetics Lab Includes:

• Intro to Genetics lab handout (2 pages)
• Teacher lesson plan (2 pages)
• Presentation showing phenotypes (7 slides)
• PDF, editable MS Word, and Google Slides versions

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