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Human Genetics
the physical characteristics that are common genetic traits inherited from one generation to the next
- dominant and recessive traits
Free vs. Attached earlobes
Free earlobes
- dominant trait
- hang below the point of the attachment to the head
Attached earlobes
- recessive trait
- are attached directly to the side of the head

Ear Wiggling
Can move ears
- dominant
- although this may be variable
Can't move ears
- recessive
*ear wiggling may be connected to tongue rolling in males

Straight vs. Curved Thumbs
Straight thumbs
- dominant
- can be seen as nearly a straight line and may contain a slight arch when viewed from the side as in the illustrations
Curved thumbs
- recessive
- can be seem as part of a circle

Bent vs. Straight Pinky
Bent pinky
- dominant trait
Straight pinky
- recessive trait
*hold your hands together as if you are covering your face. if the tips of the pinkies point away from one another, the pinkies are bent

Tongue Rolling
Rolling
- dominant
Non-rolling
- recessive

Dimples
Dimples
- dominant
No dimples
- recessive

Hand Clasping
*hand clasping is believed to be determined by genetic factors, although it is unclear if one trait is dominant over the other
Left thumb on top
- 55% of people do this
Right thumb on top
- 44% of people do this

Cleft Chin
Cleft chins
- dominant
No cleft chin
- recessive

Widow's Peak
Widow's peak hairline
- dominant
No widow's peak
- recessive

With vs. Without White Forelock
White Forelock
- dominant trait
- a patch of white hair, usually located at the hairline just above the forehead
No white forelock
- recessive trait

Hair on Middle Segment of Finger
Hair
- dominant
- the presence of hair on the middle segment of any finger
No hair
- recessive

PTC Tasting
PTC tasting
- dominant
- 75% of individuals can taste the bitter flavor of PTC
Non-tasting
- recessive
- 25% of individuals find the PTC paper tasteless
*PTC is a bitter flavor compound that often causes people to dislike certain foods, such as broccoli, coffee, or beer
