Two pure-breeding mutant plants produce white flowers. When they are crossed, all of the progeny have wild-type purple flowers. What does this genetic complementation tell you?A) The genes are part of two distinct biosynthetic pathways.B) The two lines exhibit different mutations in the same gene.C) More than one gene is involved in determining the phenotype.D) The allele is pleiotropic.E) The allele exhibits incomplete dominance.

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Asked Sep 14, 2019
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Two pure-breeding mutant plants produce white flowers. When they are crossed, all of the progeny have wild-type purple flowers. What does this genetic complementation tell you?

A) The genes are part of two distinct biosynthetic pathways.

B) The two lines exhibit different mutations in the same gene.

C) More than one gene is involved in determining the phenotype.

D) The allele is pleiotropic.

E) The allele exhibits incomplete dominance.

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Expert Answer

Step 1

Complementation means that wild copies of 2 genes are needed to perform a function. If either gene is not functioning, it results in mutant phenotype.

Step 2

If purple coloured flowers are normal or wild and it results in a white flower mutant, then the mutation might be in a regulatory or structural gene. Mutations in regulatory genes do not need to affect only one structural gene, several of the structural genes may fail to be turned on at the c...

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Genetics and Epigenetics

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