Transcript ppt

So what dominant
and recessive traits
do I have?
Wait, before we begin…
Does dominant
mean “more
common”?
Let’s look at some specific examples:
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".
E-
ee
T-
tt
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).
http://student.biology.arizona.edu/scic
onn/heredity/worksheet_heredity.html
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).
Dimples: Dimples are a dominant trait (D-). If you don't have
dimples, you are recessive (dd).
D-
dd
Bent Little Finger: Look at the little
finger on each hand. If they bend in
toward your ring finger, you have the
dominant gene (L-). If they don’t bend
you have the recessive genes (ll)
Freckles: If you have freckles then you have a dominant gene
(F- ). If you don't have freckles then you are recessive (ff).
Widow's Peak: If your hairline is shaped in a downward "V",
then you are dominant for that gene (W-).
W-
ww
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"??