Download dominant and recessive characteristics

DOMINANT AND RECESSIVE CHARACTERISTICS
Characteristics in the left-hand column dominate over those
characteristics listed in the right-hand column.
DOMINANT TRAITS
RECESSIVE TRAITS
eye coloring
brown eyes
eyes
grey, green, hazel, blue
vision
farsightedness
normal vision
normal vision
normal vision
normal vision
nearsightedness
night blindness
color blindness*
hair
dark hair
non-red hair
curly hair
full head of hair
widow's peak
blonde, light, red hair
red hair
straight hair
baldness*
normal hairline
facial features
dimples
no dimples
unattached earlobes
attached earlobes
freckles
no freckles
broad lips
thin lips
appendages
extra digits
fused digits
short digits
fingers lack 1 joint
limb dwarfing
clubbed thumb
double-jointedness
normal number
normal digits
normal digits
normal joints
normal proportion
normal thumb
normal joints
other
immunity to poison ivy
normal pigmented skin
normal blood clotting
normal hearing
normal hearing and speaking
normal- no PKU
susceptibility to poison ivy
albinism
hemophilia*
congenital deafness
deaf mutism
phenylketonuria (PKU)
Heredity and Genetics
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.
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".
Tongue Rolling
T-
tt
(circle one)
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).
Attached Earlobes
E-
ee
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).
Interlocking Fingers
I-
ii
Dimples: Dimples are a dominant trait (D-). If you don't have
dimples, you are recessive (dd).
Dimples
D-
dd
Sex: Males possess a "Y" chromosome and should circle XY. Females
possess two "X" chromosomes and should circle XX.
Sex
XY
XX
Bent Little Finger: Look at the little finger on each hand. If
they bend in toward your ring finger, you have the dominant gene.
Bent Little Finger
L-
ll
Double Jointed Thumb: If you have double jointed thumbs, you have
the dominant gene.
Double Jointed Thumb
J-
jj
Freckles: If you have freckles then you have a dominant gene (F). If you don't have freckles then you are recessive (ff).
Freckles
F-
ff
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"??
PTC Taste
Ppp
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).
Sodium Benzoate Taste
S-
ss
Widow's Peak: If your hairline is shaped in a downward "V", then
you are dominant for that gene (W-).
Widow's Peak
W-
ww
Cystic Fibrosis
Sickle Cell Anemia,
Tay Sachs Disease