Extensions to Mendel Video Lessons

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Problem: You cross two true breeding lines of petunia. One produces red flowers and the other white flowers. The F1 offspring all show pink flowers. You conclude from this that:A. Red is dominant.B. White is dominant.C. Red is incompletely dominant.D. Red is recessive.E. None of the answers listed above are correct.

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Having true breeding lines of petunia simply means that both lines used for the cross is homozygous for the trait. However, neither trait was shown as the phenotype of the progeny. This is an example of an inheritance pattern that is somewhat more complex than that predicted by Mendleian genetics.  

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Problem Details

You cross two true breeding lines of petunia. One produces red flowers and the other white flowers. The F1 offspring all show pink flowers. You conclude from this that:

A. Red is dominant.

B. White is dominant.

C. Red is incompletely dominant.

D. Red is recessive.

E. None of the answers listed above are correct.

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Extensions to Mendel concept. You can view video lessons to learn Extensions to Mendel. Or if you need more Extensions to Mendel practice, you can also practice Extensions to Mendel practice problems.