Name: _________________ Conference/HR: _______________ Date: ____________
Punnett Square Worksheet 3
Directions: Complete the following Punnett Squares, on your OWN paper. Be sure that
you list the genotypes and phenotypes of the traits AND the percent chance for each
1. In horses, a brown coat of hair (B) is always dominant. A spotted coat
of hair (S) is dominant over every hair color EXCEPT black. A white
coat of hair (w) is always recessive. If a white horse has offspring
with a brown horse who had a mother with a spotted coat, what are
the possible genotypes and phenotypes of their offspring and the
percent chance of each?
HINT: Start by figuring out the genotype of the brown horse.
2. In dogs, blue eyes (b) are always recessive. Brown eyes (B) are
always dominant. Black eyes (A) are dominant over every eye color
EXCEPT brown. If a brown-eyed dog (BB) has offspring with a
black-eyed dog who had a mother with blue eyes, what are the
possible genotypes and phenotypes of their offspring and the percent
chance of each?
HINT: Start by figuring out the genotype of the black-eyed dog.
3. In aliens, purple hair (P) is always dominant. Red hair (r) is always
recessive. Green hair (G) is dominant over every hair color EXCEPT
purple. If an alien with green hair (he had a mother with red hair) has
offspring with an alien with purple hair (she also had a mother with
red hair), what are the possible genotypes and phenotypes of their
offspring and the percent chance of each?
HINT: Start by figuring out the genotype of the two aliens having
offspring.
4. In giraffes, a long neck (L) is always dominant. A medium-sized neck
(M) is dominant over every neck size EXCEPT a long neck. A short
neck (s) is always recessive. If a giraffe with a short neck has
offspring with a giraffe with a medium-sized neck (he had a father
with a short neck), what are the possible genotypes and phenotypes of
their offspring and the percent chance of each?
HINT: Start by figuring out the genotype of the giraffe with the
medium-sized neck.