Unattached/free earlobes

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Phenotypes Lab

Answer the following questions regarding your physical traits. Determine how many dominant and recessive traits you have. Test your parent(s) to see which versions of the traits you inherited:


  1. Unattached/free earlobes (dominant trait) or attached earlobe (recessive trait)

  2. Hairy ears: hair present( recessive) or hair absent( dominant)

  3. Face Shape: round (dominant) or square (recessive)

  4. Freckles or moles (facial): present (dominant) or absent (recessive)

  5. Chin Shape: very prominent (dominant) or less prominent(recessive)

  6. Chin Shape: round (dominant) or square(recessive)

  7. Cleft Chin: present (dominant) or Absent (recessive)

  8. Hair's natural body: Curly (homo. dom.) or Wavy (hetero.) or Straight (homo. rec.)

  9. Widow’s peak: Present (dominant) or absent (recessive)

  10. Eyebrows: bushy (dominant) or fine(recessive)

  11. Eyebrows: connected (recessive) or not connected (dominant)

  12. Eye Distance: close (homo. dom.) or average(hetero.) or far (homo. rec.)

  13. Eye size: large (homo. dom.) or medium (hetero.) or small (homo. rec.)

  14. Eye shape: almond (dominant) or round (recessive)

  15. Eye Slant: horizontal (dominant) or upward (recessive)

  16. Eyelash length: long (dominant) or short (recessive)

  17. Dimples (dominant trait) vs. No dimples (recessive trait)
    Dimples are natural dents in the face to the right or left of the mouth.  If a person has only one dimple, they should be counted as having dimples

  18. Mouth Shape: long (homo. dom.) or average (hetero.) or small (homo. rec.)

  19. Lip Size: thick (dominant) or fine (recessive)

  20. Hapsburg lip: protruding(homo. dom.) or slight (hetero.) or absent (homo. rec.)

  21. Tongue roll- Can the tongue curl or roll into a “u”-shaped tongue?(Dom.)

  22. Tongue flip - tongue can be turned completely over(Dom.)

  23. Ski tongue: tongue can extend out and touch nose, forming a “ski”(Dom.)

  24. Nostril Shape: rounded (dominant) or flared (recessive)

  25. Nose size: big (homo. dom.) or medium (hetero.) or small (homo. rec.)

  26. Nose shape: rounded (dominant) or pointed(recessive)

  27. Ear to Nose relationship: Large ears/ wide nose (dominant) or small ears/narrow nose(recessive)

  28. Second toe longer than great toe (Dominant) - See trait graphic at bottom.

  29. Hitch hikers/bent thumb(dominant trait) or straight thumb (recessive trait)

  30. Thumbness: Right or left thumbed? Have student put hands together, interweaving his/her fingers (See graphic). Check which thumb is on top. Since some students can’t decide by this method, then ask which index finger is on top. That will be which thumb should also be on top. After they have figured this out, have them replace their hands together with the opposite thumb on top..... This feels very strange! ) Right is Dominant.

  31. Long or short index finger - Put hand on the edge of a piece of paper so that the middle finger is slightly above the edge and the 3rd finger of each hand is right on the edge. Where is the index finger? Even with or LONGER than the 3rd finger? Shorter? Dominant = even with the 3rd finger. (see graphic below)

  32. Bent little finger (dominant trait), or straight (recessive trait)

  33. Mid-digit hair (dominant trait) vs. No mid-digit hair (recessive trait)

  34. Handedness: Right or left handed? (Right is Dominant)

  35. "Witch's fingers" (Dominant) It is when the person can keep the proximal
    phalanx and middle phalanx straight and bend the distal phalanx. (1st two
    joints straight, and bend tip of finger)

  36. Angel’s wings (Dominant) "Angels Wings" is the ability to semi-dislocate the shoulder bone. When a person who can do this presses their two palms together, pushing with their arms, their shoulder blades "jump out" looking like two wings! It’s pretty amazing if you've never seen it!


Phenotypes Lab Write-Up

  • How many dominant traits do you have?

  • How many recessive traits do you have?

  • What is your dominant to recessive ratio?


  • Compare your dominant traits to your parent(s), how many traits do you share in common?

  • Compare your dominant traits to your sibling or other relative, how many traits do you share in common?

  • Compare your dominant traits to your friend(s), how many traits do you share in common?

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