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Determining Your
Genes:
Did you know that your genes
determine whether or not you possess certain physical traits? Well,
they do. It's your genes that make you blue eyed or brown eyed, or
have brown or blond hair. These traits are highly complex, and
involve the interaction of many genes. However, several traits are
determined by only one gene, and if you have the gene then you have
the trait.
You have two genes for every trait.
You get one from your mother and one from your father. Certain
genes are dominant, and you only need one of the pair to give you
its trait. If you don't have a dominant gene, then you are
recessive for that trait. Dominant genes are represented as capital
letters and recessive genes as lower-case letters. Circle which
genes you possess for each of the following traits.
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Tongue
Rolling: Can you roll your tongue into a U-shape? Try it. If
you can, then you possess the dominant gene and should circle "T-".
If you can't roll your tongue, you have two recessive genes, and
should circle "tt".
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Tongue Rolling
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(circle one)
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Attached Earlobes: Have a
partner examine your earlobes. If they hang free at the bottom, you
are dominant (E-). If they are attached, you are recessive
(ee).
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Attached Earlobes
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Interlocking Fingers: Fold your hands together by interlocking
your fingers. Which thumb is on top? If the left thumb is on top,
you are dominant (I-). If the right thumb is on top, you are
recessive (ii).
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Interlocking Fingers
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Dimples: Dimples are a dominant trait (D-). If you don't have
dimples, you are recessive (dd).
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Dimples
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Sex: Males possess a "Y" chromosome and should circle XY.
Females possess two "X" chromosomes and should circle
XX.
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Sex
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Bent Little Finger: Look at the little finger on each hand. If
they bend in toward your ring finger, you have the dominant
gene.
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Bent Little Finger
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Double Jointed Thumb: If you have double jointed thumbs, you
have the dominant gene.
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Double Jointed Thumb
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Freckles: If you have freckles then you have a dominant gene
(F- ). If you don't have freckles then you are recessive
(ff).
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Freckles
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PTC Taste: Chew a taste strip. Some people can taste PTC, and
others cannot. If the strip tastes bitter to you, you are a
"taster" and have the dominant gene for this trait (P-). If the
strip doesn't taste like anything, you are recessive (pp). 70% of
the people in the United States are "tasters". Is anyone in the
room a "non-taster"??
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PTC Taste
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Sodium Benzoate Taste: Different genes determine if you can
taste sodium benzoate. If it tastes salty, bitter, or sweet to you,
then you have the dominant gene (S-). If you don't taste anything,
you are recessive (ss).
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Sodium Benzoate Taste
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Widow's Peak: If your hairline is shaped in a downward "V",
then you are dominant for that gene (W-).
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Widow's Peak
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