Solutions For An Introduction to Genetic Analysis Chapter 2 Problem 47P

So, the gene symbols for the respective phenotypes are as follows:

• Blotched =A

• Unblotched =a

The cross between (A/a× A/a) is as follows:

Thus, the phenotype obtained to be

This hypothesis can be tested by using a test cross. In a test cross, an individual whose genotype is unknown is crossed with an individual who is homozygous recessive. The genotype of any individual whose phenotype expresses the dominant trait can be determined by a testcross. All Unblotched plants should be pure-breeding in a test cross. That is, when crossed with a/a.

Thus, of the blotched plants should be pure-breeding.