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If both parents can help determine a trait in the progeny, this implies that both parents must be contributing

Question
If both parents can help determine a trait in the progeny, this implies that both parents must be contributing
a copy of the same gene
completely unrelated, different genes for the same trait
no genetic material relevant to that trait
only physical resemblance, not genetic material
Answer
a copy of the same gene
Detailed Explanation
Since both parents can influence a trait's expression, the chapter concludes both must contribute a copy of the same gene controlling that trait.
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