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Punnett Squares
Contribué par: Ruffini
What percentage of the offspring will have black masks
In Racoons, it is a dominant trait for them to develop
a black mask around their eyes.  If they inherit the
recessive trait, they don't get a mask but instead their
face is all gray.
Cross a hybrid black mask raccoon with a gray face.
0%
50%
75%
100%
In anteaters, long tongues are dominant over short
tongues.
Cross a homozygous long tongue with a  short tongue
What percentage of the offspring will long tongues?
0%
50%
75%
100%
On the planet Zolar, pink spots are dominant over
purple spots on the giant alien cows that live there.
What percentage of the offspring will have purple spots?
0%
Cross a hybrid pink spotted cow with a  purple
spotted cow.
50%
75%
100%
What percentage of the offspring will have short horns?
Long horns are dominant in Crenshaw cattle over
short horns.
0%
Cross  a purebred long horn with a purebred short
horn.
50%
75%
100%
What percentage of the offspring will have black eyes
Black eyes are dominant in rats, while pink eyes are
recessive.
0%
Cross two heterozygous black eye rats
50%
75%
100%
What percentage of the offspring will have red roses.
Red is a dominant color in roses.  White is a recessive
color in roses.
Cross  a heterozygous red rose with a homozygous
white rose.
0%
50%
75%
100%
In an experiment done by Mendel on pea height, he
found that 75% of the offspring were tall and 25%
were short.  Which cross represents the genotypes
of the parent plants that he must have used in this
experiment?
TT x TT
Tt x tt
Tt  x Tt
tt x tt
Blue tails are dominant in critters over orange tails.
Cross a  heterozygous blue tail with a homozygous
orange tail
0%
What percentage of the offspring is expected to have
orange tails
25%
50%
100%
If Blue tails are dominant over orange tails.  Which
cross would never result in orange tails?
 TT x tt
Tt x Tt
Tt x tt
tt x tt
In humans tongue rolling is a dominant trait that
involves specific muscle control.  What percentage
of the population would you expect can NOT roll
their tongues?
0%
25%
50%
75%
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