#1 - Earlobes

Dominant

Free• They hang below the

point of attachment to the head.

Recessive

Attached• They are attached

directly to the side of the head.

#2 - Dimples

Dominant

Dimples• Natural dents in the face to

the side of the mouth when a person smiles. If a person only has one dimple, they should be counted as having dimples.

Recessive

No Dimples

#3 – Hitchhikers Thumb

Dominant

Straight Thumb• When you extend your

thumb and it stays mostly straight.

Recessive

Curved Thumb• When you extend

your thumb and it curves to the left.

#4 – Tongue Rolling

Dominant

Can Roll Tongue• The ability to turn the sides

of your tongue so that, near the tip, the sides nearly touch on top.

Recessive

Cannot Roll Tongue

#5 – Chin

Dominant

Cleft Chin• If you have a dimple in your

chin it is considered to be cleft.

Recessive

No Cleft Chin

#6 – Hairline

Dominant

Widow’s Peak

Recessive

No Widow’s Peak

#7 – Writing Hand

Dominant

Right-handed

Recessive

Left-handed

#8 – Hair Type

Dominant

Naturally curly hair

Recessive

Naturally straight hair

#9 – Thumb Crossing

Dominant

Left thumb on top• Fold your hands together by

interlocking your fingers without thinking about it.

Recessive

Right thumb on top

#10 – PTC Taste(Phenylthiocarbimide)

Dominant

Can taste PTC

• The paper tastes bitter.

Recessive

Cannot taste PTC

• The paper tastes like nothing at all.