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Tongue Rolling Attempt to roll your tongue into a U-shape, in which the sides of your tongue are curled upwards. Tongue rollers carry a dominant gene, R. Widow's Peak A dominant gene W causes the hairline to form a distinct downward point in the center of the forehead. Baldness will mask the expression of this gene.
Earlobe Attachment The inheritance of a dominant gene E results in the free or unattached earlobe. If the lobe is attached directly to the head, the recessive, or ee genotype has been inherited.
Hitchhiker's Thumb Some individuals can bend the last joint of the thumb backwards at about a 45 degree angle. These individuals are homozygous for a recessive gene (ht), but there is considerable variation in the expression of the gene. For our purposes we shall consider those who cannot bend at least one thumb backwards about 45 degrees, are carrying the dominant gene (HT).
Bent Little Finger The dominant gene F causes the terminal bone of the little finger to angle toward the fourth (ring) finger. Individuals whose little fingers are straight possess the homozygous recessive condition, ff. Check for this characteristic by laying your hands flat on the table and relaxing them.
Mid-digital Hair The presence of hair on the middle segment of the fingers is caused by a dominant gene, M. The homozygous recessive condition, mm, results in the lack or absence of hair on the middle segments.
Facial dimples The inheritance of cheek dimples is controlled by a dominant gene D. The dd genotype or condition lacks the ability to express facial dimples.
Hallux Length The length of the big toe (hallux) is governed by the gene H. Individuals whose hallux is shorter in comparison to the second toe possess the dominant gene H. The inheritance of the homozygous recessive genotype (hh), results in the big toe being longer than or equal to the second toe.
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