Name: ______________________ Date:_________________________
Part1: Single-Gene Traits
in Humans
Mark an X in the box that best describes you for every characteristic.
Dominant
Tongue roller
Crossed hands:
Left thumb on top
Widow’s peak
Can wiggle ears
No hitchhiker’s
thumb
Bent pinky
Free ear lobes
Hair on middle finger
segment
Dimples on face
Recessive
Non tongue roller
Crossed hands:
Right thumb on top
No widow’s peak
Cannot wiggle ears
hitchhiker’s thumb
Straight pinky
Attached ear lobes
No hair on middle
finger segment
No dimples on face
If you have doubts about the meaning of some of the traits,
please visit one of these sites or ask your teacher for help.
Reference to see examples of the traits:
http://www.nyscience.org/marvelousmolecules/ma-traits.html
http://151.198.194.83/vailsburg/VMS%20Human%20Genetics/traits.htm
Name: ______________________ Date:_________________________