Name________________________________________
Date_______
Heredity
Gregor Mendel, who is sometimes called the “Father of Genetics” performed experiments on pea
plants. His experiment including his actual data is shown below. An advantage to using pea
plants is that they can mate with themselves (shown in the diagram as a semicircular arrow with a
cross). A self-cross (mating with themselves) is equivalent to crossing A with A or B with B, in our
lab. Look at the diagram below and then answer the questions.
a. Write in the phenotypes beside each pod.
b. Is green or yellow the dominant trait? HDYK?
© Modeling Instruction - AMTA
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Unit 7 - Heredity
Name________________________________________
Date_______
Heredity
c. Which crosses are true breeding (produce offspring which are identical to the parents)?
d. Are the genotypes of the truebreeding parents and offspring in these crosses
homozygous or heterozygous? Explain.
e. Write in the genotypes of the plants involved in the true breeding crosses.
f. Create a Punnett square for Cross IV. Do all green pods produced from this cross
have the same genotype? Explain.
g. If you were given a green pod, how could you determine its genotype? Explain.
h. Cross VI produced only yellow plants. Draw the Punnett square for this cross.
i. Cross V produced both green and yellow plants. Would you have predicted that
result? Use a Punnett square to support your prediction.
© Modeling Instruction - AMTA
2
Unit 7 - Heredity