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

question 66

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.

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