Dihybrid Punnett Squares
Name __________________________ Date ________
1. In Loo-Loo Birds, long wings (L) are dominant to short wings (l) and big eyes (B) are
dominant to small eyes (b). Draw the punnett square for the following cross:
LlBB x llBb
What is the probability that the couple will produce an offspring whose phenotype is…
Long wings and Big eyes?
Long wings and small eyes?
short wings and Big eyes?
short wings and small eyes?
Phenotypic ratio: _____________________________________
2. In unicorns, a rainbow mane and tail (R) is dominant to a brown mane and tail (r) and glitter
coat (G) is dominant to a white coat (g). What is the phenotypic ratio produced by crossing
two individuals who are both heterozygous for these two traits?
____________ x ____________
Phenotypic ratio: _____________________________________
3. In crazy-haired dancing hippos, dancing (D) is dominant and non-dancing (d) is recessive.
Mohawks (M) are dominant and flat hair (m) is recessive. What are the phenotypic ratios of
the cross of these two parents?
DdMm x ddmm
Phenotypic ratio: _____________________________________
4. A florist crosses flowers with a horrible fragrance (H) dominant to no fragrance (h) and a
magenta color (M) dominant to a white color (m). What is the probability that these two
individuals will produce offspring that are magenta with a horrible fragrance?
hhmm x HHMm
Phenotypic ratio: _____________________________________
5. Wonder Woman and Spiderman are expecting their first baby. They are hopeful that their
baby will get Wonder Woman’s super strength (S) and Spiderman’s web-throwing abilities
(W), both dominant traits. What are the chances that they will have a child with these
characteristics? Wonder Woman is homozygous dominant for super strength and
homozygous recessive for web-throwing. Spiderman is homozygous recessive for super
strength and homozygous dominant for web-throwing.
____________ x ____________
Phenotypic ratio: _____________________________________
6. Ms. Solomon is planning on marrying Justin Beiber, but Ms. Monroe is going to stop the
wedding because she is worried that their babies will be totally obnoxious, a dominant
characteristic (O). However, they could have fantastic hair (H). Should Ms. Monroe
worry? Will Ms. Solomon and Justin Beiber have obnoxious children with fantastic hair?
Show the possible ratios. Ms. Solomon’s genotype is ooHh and Justin Beiber’s genotype is
OOHh.
____________ x ____________
Phenotypic ratio: _____________________________________