Human Genetics

Trait Description

Yourself

Class numbers

Tongue rolling

   

Bent little fingers  

   

Widow’s peak

    

Hitchhiker’s Thumb

    

Hand clasping, left over right thumb

    

Arm folding ­ fold your arms across your chest/stomach…which one is on top?

    

Free earlobe

    

Chin cleft

    

Hair on middle joints of fingers

    

Short big toe

    

Ear points

    

Round face

    

Curly hair

    

P.T.C Taster

    

Eye Color (blue?)

    

Tongue Rolling

Widows Peak
     

Hitchhiker’s thumb
 Blue eyes When a person is homozygous for a recessive gene no pigment is deposited in the from part of the eye and a blue layer at the back of the iris shows through.  A dominant gene, allows pigment to be deposited which masks the blue color.  Other genes are responsible for the type and amount of this pigment leading to various shades of brown, hazel, green and other colors.