In Garden Peas, the Allele for Tall Plants Is Dominant

Multiple Choice

In garden peas, the allele for tall plants is dominant over the allele for short plants. A true-breeding tall plant is crossed with a short plant, and one of their offspring is test crossed. Out of 20 offspring resulting from the test cross, about _______ should be tall.

A) 0
B) 5
C) 10
D) 15
E) 20