Imagine You Do a Test Cross Between a Purple-Flowered Pea

Multiple Choice

Imagine you do a test cross between a purple-flowered pea plant having serrated leaves (a dominant trait) and a white-flowered pea plant having smooth edges. If the purple-flowered plant is heterozygous for both traits, the expected ratio in the offspring is 1 purple-serrated:1 purple-smooth:1 white-serrated:1 white-smooth. Instead, you see 4 purple-serrated:1 purple-smooth:1 white-serrated:4 white-smooth. What is the explanation of this ratio?

A) There is incomplete dominance.
B) The genes are linked.
C) The genes are linked and there is incomplete dominance.
D) There has been a mutation during the cross.