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Pea Pod Investigation
供稿人: Ruffini
According to the infomation in the Punnett square,
what percent of the offspring is expected to have
yellow pods?
A plant with green pods is crossed with a plant
 that has yellow pods.  The genotype of each parent
 plant is represented by the Punnett square shown.

25%
0 %
100%
50%
What genotype belongs
 in box #1?

Two of the twenty pea plants resulting from
experiment 2 are crossed.  Both pea plants have
green pods.  The assumption made is that the
green pod color (G) is dominant over yellow pod
color (g)
gg
GG
Gg
1.
What genotype belongs
 in box #2?

Two of the twenty pea plants resulting from
experiment 2 are crossed.  Both pea plants have
green pods.  The assumption made is that the
green pod color (G) is dominant over yellow pod
color (g)
gg
GG
Gg
2.
What genotype belongs
 in box #3?

Two of the twenty pea plants resulting from
experiment 2 are crossed.  Both pea plants have
green pods.  The assumption made is that the
green pod color (G) is dominant over yellow pod
color (g)
gg
GG
Gg
3.
What genotype belongs
 in box #4?

Two of the twenty pea plants resulting from
experiment 2 are crossed.  Both pea plants have
green pods.  The assumption made is that the
green pod color (G) is dominant over yellow pod
color (g)
gg
GG
Gg
4.
What percentage of  pea plants from this cross are
expected to have yellow pods? 
0%
75%
25%
50%
A student crosses two green plants.  She observes that
approximately 75% of the plants resulting from this
cross have green pods and approximately 25% have
yellow pods.  What are the most likely genotypes of the
parent plants?
GG x gg
gg x gg
GG x Gg
Gg x Gg
Mule deer begin eating most of the yellow pods from
the pea plants in a field and stop eating the green
pods.  If this trend continues, what will most likely
occur?
The pea plants will produce more yellow pods
The pea plants will all die out
The allele for green pods will become more common
The allele for yellow pods will become dominant
Caleb crossed his first generation of plants in the pod
color group.  He saw that 25% of the plants produced
yellow pods.  Which of these would be the best test
cross to make next to determine whether the plants
with green pods are carriers of the recessive trait?
Green-pod plant with green-pod plant
Yellow-seed plant with yellow-seed plant
Green-pod plant with yellow-pod plant
Yellow-seed plant with green-seed plant
Investigation #2 "The dominant Pea"
Which of the following is the independent variable
in the investigations?
Which plants are crossed
Where the plants are grown
Exposure to sunlight
Amount of water
Which of these tools is the most useful for observing
the parts of a white flower on a pea plant?
Metric Ruler
Electronic balance
Graduated cylinder
Magnifying glass
Caleb crossbreeds a pea plant with round seeds(R) and
a pea plant with wrinkled seeds.(r)  The genotypes of the
two plants are given below.  All the plants were grown
in the same location under identical conditions.
What is the pobability that an offspring will have
wrinkled seeds?
0%
Complete a Punnett square that shows a cross
between a heterozygous plant with round seeds
and a homozygous plant with wrinkled seeds
50%
75%
100%
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