In corn, the C gene normally expresses pigment that gives rise to purple-pigment

Question

In corn, the C gene normally expresses pigment that gives rise to purple-pigmented kernels. However, when the C gene is inactivated, say, by the insertion of a transposable element, kernels are colorless - they lack a purple color and appear yellow. An ear of corn has some purple kernels, some yellow kernels, and some yellow kernels with purple spots. What could have occurred to allow the yellow kernels to have purple spots? Answer The C gene has been inactivated by the insertion of either an Ac or a Ds element - one cannot tell for sure - and the element does not excise itself during development. A Ds element hopped into the C gene during kernel development. An Ac element somewhere in the genome has made a transposase that allows a Ds element in the C gene to hop out of the C gene during kernel development. Methyl-directed mismatch repair occurred in some cells during kernel development. An Ac element inserted itself into the C gene during kernel development. Nucleotide excision repair occurred in some cells during kernel development.

Explanation / Answer

Nucleotide excision repair occurred in some cells during kernel development.

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