Heredity IV: Eye Color and Pinna

This simulation can be used to test the heredity of two traits; eye color and the presence of the pinna, an external ear structure. You can test one trait at a time or both at once (a dihybrid cross). In this population, females are slightly smaller and have darker coloring, while males are larger and have brighter coloring.

 

Click on a pair to select those phenotypes for the P generation. All P generation organisms are assumed to be true breeding (homozygous). After selecting the P generation, F1 generation data will be displayed at the top of the page. Then, click on the the F1 cross at the bottom of the simulation to produce the F2. The F2 results will be displayed at the top of the simulation. In addition to F1 crosses, a backcross can be selected for the white eyes/pinna x black eyes/no pinna P generation crosses.

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This blog post gives an explanation of linked genes and recombination. Worksheet and virtual lab options to accompany this simulation are available.