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Human Genetics Trait Description 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 Hitchhiker’s thumb Yourself Widows Peak 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. Class numbers
