Genetics Workbook
Punnett Squares & the Monohybrid Cross
1. A homozygous female black cat is walking down the street in the middle of the night
when it sees a homozygous recessive male cat eating trash out of a garbage can. If B
is dominant over b, what will the genotypes and phenotypes of the F1 & F2 generation
be? Make sure to include the phenotypic ratio.
2. A homozygous recessive chipmunk that has stiff cheeks, is jealous of a homozygous
dominant chipmunk that has stretchy cheeks. If S is dominant over s, what will the
genotypes and phenotypes of the F1 & F2 generation be? Make sure to include the
phenotypic ratio.
3. A homozygous recessive tree frog falls out of a tree from losing its grip. After
landing on its back, its eyes slowly open, seeing a homozygous tree frog climbing
with ease. If G is dominant over g, what will the genotypes and phenotypes of the
F1 & F2 generation be? Make sure to include the phenotypic ratio.
4. A homozygous rabbit with long teeth is sharing a carrot with a homozygous recessive
rabbit. As they chew on either end, they get closer to each other. Their eyes lock
and immediately fall in love. If T is dominant over t, what will the genotypes and
phenotypes of the F1 & F2 generation be? Make sure to include the phenotypic ratio.
, Genetics Workbook
Test Crosses
1. A sweet lemon tree is crossed with a sour lemon tree, in which 75% of the F1 generation
was sweet. What were the genotypes of the parents? Could there be more than one
possible genotype for the parents? Provide the scenario(s) with Punnett Squares.
2. A pink nose (P) is dominant over a black nose (p) in tuxedo cats. Explain how you could find
out the genotype of a pink-nosed tuxedo cat? [Lab work or genetic testing is invalid].
Punnett Squares & the Dihybrid Cross
Trait Dominant Gene Recessive Gene
Tentacles Long (T) Short (t)
Luminosity Bright (B) Dim (b)
Venomous Toxic (V) Non-Toxic (v)
Speed Fast (F) Slow (f)
1. In the deep dark sea, a male, long tentacled jellyfish is getting ready to race. Its short
tentacled mother wishes her son good luck before leaving. On his way to the race, he
thinks about the things his father said to him while coaching “even though I’m physically
slow, I can use my dominant bright lights for psychological warfare". Slow jellyfish cannot
participate in this race. What are the genotypes and possible gametes of the racing
jellyfish?
Genotypes: _________________
Possible gametes: _________________
Punnett Squares & the Monohybrid Cross
1. A homozygous female black cat is walking down the street in the middle of the night
when it sees a homozygous recessive male cat eating trash out of a garbage can. If B
is dominant over b, what will the genotypes and phenotypes of the F1 & F2 generation
be? Make sure to include the phenotypic ratio.
2. A homozygous recessive chipmunk that has stiff cheeks, is jealous of a homozygous
dominant chipmunk that has stretchy cheeks. If S is dominant over s, what will the
genotypes and phenotypes of the F1 & F2 generation be? Make sure to include the
phenotypic ratio.
3. A homozygous recessive tree frog falls out of a tree from losing its grip. After
landing on its back, its eyes slowly open, seeing a homozygous tree frog climbing
with ease. If G is dominant over g, what will the genotypes and phenotypes of the
F1 & F2 generation be? Make sure to include the phenotypic ratio.
4. A homozygous rabbit with long teeth is sharing a carrot with a homozygous recessive
rabbit. As they chew on either end, they get closer to each other. Their eyes lock
and immediately fall in love. If T is dominant over t, what will the genotypes and
phenotypes of the F1 & F2 generation be? Make sure to include the phenotypic ratio.
, Genetics Workbook
Test Crosses
1. A sweet lemon tree is crossed with a sour lemon tree, in which 75% of the F1 generation
was sweet. What were the genotypes of the parents? Could there be more than one
possible genotype for the parents? Provide the scenario(s) with Punnett Squares.
2. A pink nose (P) is dominant over a black nose (p) in tuxedo cats. Explain how you could find
out the genotype of a pink-nosed tuxedo cat? [Lab work or genetic testing is invalid].
Punnett Squares & the Dihybrid Cross
Trait Dominant Gene Recessive Gene
Tentacles Long (T) Short (t)
Luminosity Bright (B) Dim (b)
Venomous Toxic (V) Non-Toxic (v)
Speed Fast (F) Slow (f)
1. In the deep dark sea, a male, long tentacled jellyfish is getting ready to race. Its short
tentacled mother wishes her son good luck before leaving. On his way to the race, he
thinks about the things his father said to him while coaching “even though I’m physically
slow, I can use my dominant bright lights for psychological warfare". Slow jellyfish cannot
participate in this race. What are the genotypes and possible gametes of the racing
jellyfish?
Genotypes: _________________
Possible gametes: _________________
