You may wish to use one student as an example and fill out the chart on the board or overhead projector. The free ear lobes shows dominance over attached ears. The occurrence of dimples appears to be dominant to cheeks without dimples. The presence of hair in this region is dominant to the absence of hair. The left thumb over the right is dominant to the right thumb over the left.
Right handedness appears to be dominant to left handedness.
They will still be able to learn from this activity. An example of a chart that could be made to help demonstrate this concept is given below. Ask a genetics counselor to speak to your class. The rules of dominance, segregation, and independent assortment are used to explain human inheritance. In this activity you will study examples of dominant and recessive traits.