Lab 11, Simple Mendelian Genetics
Name: ______________________________________ Lab Section: _________________
Pre lab questions
1. Briefly explain/define the following terms. Try to explain what do these terms really mean?
enotype:
henotype:
eterozygous:
omozygous:
The following are practice problems to acquaint you with the inheritance patterns associated
with Mendelian crosses.
Monohybrid crosses
Below is a simple monohybrid cross, examining the cross between the pea plantàinheritance
of flower color
1. The P1 generation is the original parental plants, each homozygous for their floweràcolor. In
this cross, the purple color is dominant.
Write the genotype and phenotype for the P1 plants
genotype
Purple flowered plant
White flowered plant
Cross the P1 plants using a Punnet square in the space below
Phenotype
The results from the P1 cross:
Genotype: ___________________
Phenotype: __________________
b. If you mated two of these offspring pea plants together to make an F2 generation, what
types of offspring would you see, and in what proportion? Use a Punnett square to answer.
Give both the genotype and phenotype for the offspring.
Genotype: _______________________
Phenotype: ______________________
What if you cross the homozygous recessive plant to a plant that exhibits dominant traits, but
you are unsure of its genotype. After the cross, you plant the seeds and find that /f the plants
are bearing purple flowers and /f the plants are bearing white flowers. You now know that
the second plant (not the recessive one) has a genotype of ____________________.
This type of cross is called a test cross and is used to determine the genotype of a plant or
animal with dominant traits, but unknown genotype.
Do research and find one example of when this test cross procedure would commonly be used.
Discuss the possible genotypes of this type of cross and how this would be useful.

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