Tongue Rolling
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If you have the ability to roll your tongue into a tubelike shape, you
are a "roller." Tongue rolling is determined by a dominant allele, R.
If you cannot roll your tongue, you are homozygous recessive (rr).
If you can roll your tongue, check the box.
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You
Mother
Father
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Widow's Peak
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Examine your hairline. If you have a pointed hairline forming a V, you
carry a dominant allele for a widow's peak (W). If your hairline is
straight, you are homozygous recessive for this trait (ww).
If you have a widow's peak, check the box.
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You
Mother
Father
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Attached Ear Lobes
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Examine your ear lobes. If your ear lobes are detached, even partially,
from the side of your face, you possess the dominant trait "detached
ear lobes" (E). If your ear lobes are attached to the side of your
face, you are homozygous recessive (ee).
If your earlobes are attached, check the box.
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You
Mother
Father
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Bent Little Finger
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Hold out one hand with the fingers together.
If the end joint of your little finger bends inward, you have the
dominant allel for the trait (F). If your little finger is straight,
you are homozygous recessive (ff).
If your little finger is bent, check the box.
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You
Mother
Father
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Hitchhiker's Thumb
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Hold your hand out and make a first with your thumb extended. If the
end segment of your thumb extends at an angle of less than 90 degrees
from the thumb, then you are homozygous recessive for hitchhiker's thumb
(hh). If the end segment extends at an angle of at least 90 degrees
out from the rest of your thumb, then you have the dominant allele for
the trait (H).
If you have hitchhiker's thumb, check the box.
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You
Mother
Father
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Mid-Digital Hair
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Each of your fingers is composed of three segments. If any hair grows on
the middle segment, you have the dominant allele for middigital hair (D).
If you don't have any hair on any of the middle segments of your fingers,
you are homozygous recessive for this trait (dd).
If you have hair on one of your mid-digits, check the box.
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You
Mother
Father
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Red-Green Colorblindness
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The allele for this trait is located on the X chromosome and is thus
said to be sex-linked. If you see colors normally, you carry the
dominant allele for this trait (either XBXB or
XBXb for females and XBY for males).
If, on the other hand, you are red-green colorblind, you carry the
recessive allele. Colorblind males are XbY, and colorblind
females are XbXb.
If you have red-green colorblindness check the box.
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You
Mother
Father
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Iris Pigment
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If you have blue eyes, you lack pigment on the outer layer of your iris
and are homozygous for this trait (ii). If there is any color other than
blue in your iris, you have a dominant allele for eye pigment (I). The
exact eye color of a non-blue-eyed individual is controlled by other
genes, which code for eye pigments of various colors of brown,
green, hazel, or a combination of colors.
If your eyes are any color except blue, check the box.
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You
Mother
Father
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Dimpled Chin
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A dimpled chin is caused by a dominant allele, M. If you have this
feature, you are either homozygous dominant or heterozygous for this
trait. If you lack a dimple, you are homozygous recessive (mm).
If you have a dimpled chin, check the box.
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You
Mother
Father
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