Fun with Punnett Squares
Punnett
Square
Problems
Cross a heterozygous smooth
pod plant with a homozygous
dominant smooth pod.
What are the phenotypes and
ratios for this cross?
Trait
Pod Color
Green (G)
Recessive
Allele
Constricted
(n)
Yellow (g)
Flower
Position
Plant Height
Axial (A)
Terminal (a)
Tall (T)
Short (t)
Pod Shape
Dominant
Allele
Smooth (N)
Cross a heterozygous smooth
pod plant with a homozygous
dominant smooth pod.
What are the phenotypes and
ratios for this cross?
Heterozygous smooth vs
Homozygous dominant
Heterozygous smooth vs
Homozygous dominant
Heterozygous smooth vs
Homozygous dominant
Heterozygous smooth vs
Homozygous dominant
Heterozygous smooth vs
Homozygous dominant
Heterozygous smooth vs
Homozygous dominant
Heterozygous smooth vs
Homozygous dominant
Cross two heterozygous
plants with the flower
position trait
What are the phenotypes and
ratios for this cross?
Trait
Pod Color
Green (G)
Recessive
Allele
Constricted
(n)
Yellow (g)
Flower
Position
Plant Height
Axial (A)
Terminal (a)
Tall (T)
Short (t)
Pod Shape
Dominant
Allele
Smooth (N)
Cross two heterozygous
plants with the flower
position trait
What are the phenotypes and
ratios for this cross?
Aa x aa
Aa x aa
Aa x aa
Aa x aa
Aa x aa
Aa x aa
Aa x aa
Aa x aa
Cross two heterozygous tall
plants.
What are the phenotypes and
ratios for this cross?
Trait
Pod Color
Green (G)
Recessive
Allele
Constricted
(n)
Yellow (g)
Flower
Position
Plant Height
Axial (A)
Terminal (a)
Tall (T)
Short (t)
Pod Shape
Dominant
Allele
Smooth (N)
Cross two heterozygous tall
plants.
What are the phenotypes and
ratios for this cross?
Fun with Punnett Squares
Fun with Punnett Squares
Fun with Punnett Squares
Fun with Punnett Squares
Fun with Punnett Squares
Fun with Punnett Squares
Fun with Punnett Squares
Fun with Punnett Squares
Cross two plants that are
heterozygous for green pods.
What are the phenotypes and
ratios for this cross?
Trait
Pod Color
Green (G)
Recessive
Allele
Constricted
(n)
Yellow (g)
Flower
Position
Plant Height
Axial (A)
Terminal (a)
Tall (T)
Short (t)
Pod Shape
Dominant
Allele
Smooth (N)
Cross two plants that are
heterozygous for green pods.
What are the phenotypes and
ratios for this cross?
Fun with Punnett Squares
Fun with Punnett Squares
Fun with Punnett Squares
Fun with Punnett Squares
Fun with Punnett Squares
Fun with Punnett Squares
Fun with Punnett Squares
Fun with Punnett Squares
Cross a plant that is
heterozygous for axial
flowers with a plant that has
terminal flowers.
What are the phenotypes and
ratios for this cross?
Trait
Pod Color
Green (G)
Recessive
Allele
Constricted
(n)
Yellow (g)
Flower
Position
Plant Height
Axial (A)
Terminal (a)
Tall (T)
Short (t)
Pod Shape
Dominant
Allele
Smooth (N)
Cross a plant that is
heterozygous for axial
flowers with a plant that has
terminal flowers.
What are the phenotypes and
ratios for this cross?
Fun with Punnett Squares
Fun with Punnett Squares
Fun with Punnett Squares
Fun with Punnett Squares
Fun with Punnett Squares
Fun with Punnett Squares
Fun with Punnett Squares
Fun with Punnett Squares
Fun with Punnett Squares
Fun with Punnett Squares
Cross a homozygous tall
plant with a short plant.
What are the phenotypes and
ratios for this cross?
Trait
Pod Color
Green (G)
Recessive
Allele
Constricted
(n)
Yellow (g)
Flower
Position
Plant Height
Axial (A)
Terminal (a)
Tall (T)
Short (t)
Pod Shape
Dominant
Allele
Smooth (N)
Cross a homozygous tall
plant with a short plant.
What are the phenotypes and
ratios for this cross?
Fun with Punnett Squares
Fun with Punnett Squares
Fun with Punnett Squares
Fun with Punnett Squares
Fun with Punnett Squares
Fun with Punnett Squares
Fun with Punnett Squares
TT x tt
TT x tt
Cross a plant that is
heterozygous for smooth
pods with a plant that has
constricted pods.
What are the phenotypes and
ratios for this cross?
Trait
Pod Color
Green (G)
Recessive
Allele
Constricted
(n)
Yellow (g)
Flower
Position
Plant Height
Axial (A)
Terminal (a)
Tall (T)
Short (t)
Pod Shape
Dominant
Allele
Smooth (N)
Cross a plant that is
heterozygous for smooth
pods with a plant that has
constricted pods.
What are the phenotypes and
ratios for this cross?
Fun with Punnett Squares
Fun with Punnett Squares
Fun with Punnett Squares
Fun with Punnett Squares
Fun with Punnett Squares
Fun with Punnett Squares
Fun with Punnett Squares
Fun with Punnett Squares
Fun with Punnett Squares
When a tall plant is crossed
with a short plant, some of
the offspring are short.
What are the genotypes of
the parents?
Trait
Pod Color
Green (G)
Recessive
Allele
Constricted
(n)
Yellow (g)
Flower
Position
Plant Height
Axial (A)
Terminal (a)
Tall (T)
Short (t)
Pod Shape
Dominant
Allele
Smooth (N)
When a tall plant is crossed
with a short plant, some of
the offspring are short.
What are the genotypes of
the parents?
Fun with Punnett Squares
Fun with Punnett Squares
Fun with Punnett Squares
Fun with Punnett Squares
Fun with Punnett Squares
Fun with Punnett Squares
Fun with Punnett Squares
Fun with Punnett Squares
Fun with Punnett Squares
Fun with Punnett Squares
Three-fourths of the plants
produced by a cross between
two unknown pea plants have
axial flowers and one-fourth
have terminal flowers.
What are the genotypes of
the parents?
Trait
Pod Color
Green (G)
Recessive
Allele
Constricted
(n)
Yellow (g)
Flower
Position
Plant Height
Axial (A)
Terminal (a)
Tall (T)
Short (t)
Pod Shape
Dominant
Allele
Smooth (N)
Three-fourths of the plants
produced by a cross between
two unknown pea plants have
axial flowers and one-fourth
have terminal flowers.
What are the genotypes of
the parents?
Genotypes of Parents:
¾ axial 1/4 terminal
Genotypes of Parents:
¾ axial 1/4 terminal
Genotypes of Parents:
¾ axial 1/4 terminal
Genotypes of Parents:
¾ axial 1/4 terminal
Genotypes of Parents:
¾ axial 1/4 terminal
Genotypes of Parents:
¾ axial 1/4 terminal
Genotypes of Parents:
¾ axial 1/4 terminal
Fun with Punnett Squares
Fun with Punnett Squares
Fun with Punnett Squares
What cross would result in ½
of the offspring having green
pods and and ½ of the
offspring having yellow pods?
What must the parents’
genotypes be?
Trait
Pod Color
Green (G)
Recessive
Allele
Constricted
(n)
Yellow (g)
Flower
Position
Plant Height
Axial (A)
Terminal (a)
Tall (T)
Short (t)
Pod Shape
Dominant
Allele
Smooth (N)
What cross would result in ½
of the offspring having green
pods and and ½ of the
offspring having yellow pods?
What must the parents’
genotypes be?
Fun with Punnett Squares
Fun with Punnett Squares
Fun with Punnett Squares
Fun with Punnett Squares
Fun with Punnett Squares
Fun with Punnett Squares
Fun with Punnett Squares
Fun with Punnett Squares
Fun with Punnett Squares