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The absence of any 'medium-height' plants in the F1 generation of Mendel's tall x short cross indicates that

Question
The absence of any 'medium-height' plants in the F1 generation of Mendel's tall x short cross indicates that
the two parental traits blend to form an intermediate trait
only one parental trait is expressed, not a mixture of the two
the plants did not actually reproduce
height is not a heritable trait
Answer
only one parental trait is expressed, not a mixture of the two
Detailed Explanation
The lack of medium-height plants shows that only one trait (tallness) was expressed in F1, not a blended mixture of both parental traits.
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