Have you found your Long Lost Twin?

  1. Students work in pairs to help each other observe which of a pair of features they have.

  2. Starting in the center, fill out the genetic wheel.

  3. Observe and use the following phenotypes.

Inherited Characteristics

Body Part



color dark light
widow's peak present absent
whorl clockwise counter clock.
red absent present
turned up nose present absent
dimples present absent
long eye lashes present absent
ear lobes free attached
Body Parts
curved little finger absent present
middle finger hair present absent
tongue folding absent present
hitchhiker's thumb absent present
arm folding right on top left on top
Record all the dominant and recessive features using the genetic wheel.
  • Evaluation:

  • 1. How could you display the data you have collected?
  • wpe5.jpg (1611 bytes)

    2. Is there anyone in the class who is just like you?


    wpe5.jpg (1611 bytes)

    3. How many ways can a trait be expressed?


    wpe5.jpg (1611 bytes)

    4. Figure out how many ways the traits could come up. You may have to talk to your Math teacher.


wpe5.jpg (1611 bytes)

5. How many traits would there have to be so that the number of ways they could be expressedwould be greater than the number of people on earth?


wpe5.jpg (1611 bytes)

6. Be prepared to discuss the chances that there are two people on earth that are just alike.


wpe5.jpg (1611 bytes)

Genetic Wheel




These pages authored and maintained by Marcella Dawson. Revised 3/2002 . Copyright 1995 CRPC GirlTECH. All rights reserved. . Email your comments. These pages were developed through GirlTECH '96, a teacher training and student technology council program sponsored by the Center for Research on Parallel Computation (CRPC), a National Science Foundation Science and Technology Center.