01:447:384 Chapter Notes - Chapter 1: Count DataExam
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Observing Mendelian Inheritance Patterns: Corn Crosses
Dr. Valerie Schawaroch BIO 3015 Principles of Genetics Spring 2018
What does a kernel of corn represent? ___________________
What does an ear of corn represent? _____________________
Corn plants have been crossed (mated) and you will be observing the phenotypes and counting the numbers of
This ear of corn holds the F2 generation. Observe the phenotypes of the corn kernels.
List the phenotypes observed ________________________________________ these different phenotypes reflect
the alternative alleles. These are differences in a single feature/trait.
Therefore, what feature differs among the kernels on this ear of corn? ________________ This is the trait/gene.
Count the kernels on your corn cob and then pool the data with your classmates. Complete the phenotypes column
and enter the corn count data in the observed column in the two tables below.
Determine the phenotypic ratio for your data and the class data using the following formula for each phenotype, then
place it in the tables above.
Refer to the the generational crosses diagram below using the following information: (1) there is a complete
dominance relationship between the alleles, and (2) the ear of corn is the F2 generation. Based on the phenotypic
ratio of the F2 you should be able to predict the F1 generation that was self-crossed as well as the pure (or true)
breeding P (parental generation). Now complete the generational crosses diagram.
Looking across the generations above, one can infer that each individual has ____ alleles/factors per trait. Why?
total offspring counted
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