You have an F2 generation derived from two true-breeding parents with different characteristics for the same trait (determined by a single gene). What percentage of the F2 generation with a recessive phenotype would you expect to be homozygous for your single allele of interest? (Hint: the parental cross results in the F1 generation. Two F1s are crossed to get the F2 generation.)

a.     75%

b.    25%

c.     0%

d.    33%

e.     67%

f.     100%