Inheritance Lab
The goal of this assignment is to use your own physical traits (phenotypes) to infer your genetic makeup (genotypes) and make educated guesses about the genetics of your biological parents.
1. Preparation
Read: Review Chapter 8, “Patterns of Inheritance” in your Concepts of Biology textbook.
Download: Get the Inheritance Lab Directions and the Inheritance Lab Report template from your course portal.
2. Data Collection (Your Phenotypes)
Identify whether you have specific physical traits mentioned in the lab. Common examples include:
Dimples: (Presence is usually dominant).
Widows Peak: (A V-shaped hairline is usually dominant).
Earlobes: (Free-hanging vs. attached).
3. Genetic Inference (Your Genotypes)
Based on your phenotypes, determine your possible genotypes:
If you have a recessive trait (e.g., no dimples), your genotype is likely homozygous recessive (e.g., dd).
If you have a dominant trait (e.g., dimples), your genotype could be homozygous dominant (DD) or heterozygous (Dd).
4. Ancestral Analysis
Use your traits to work backward and “guess” or infer the possible genotypes of your biological parents.
Even if you do not know your biological parents, you can use Mendelian logic to determine what their genetic makeup must have been to produce your specific traits.
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