Imagine You Do a Test Cross Between a Purple- Flowered

Multiple Choice

Imagine you do a test cross between a purple- flowered pea plant having serrated leaves (both dominant traits) 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 7 purple- serrated:1 purple- smooth:1 white- serrated:7 white- smooth. What is the explanation of this ratio?

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