Question: In one cell, gene C is expressed, whereas in another cell, gene C is inactive. After the cells are fused experimentally, both copies of gene

In one cell, gene C is expressed, whereas in another cell, gene C is inactive. After the cells are fused experimentally, both copies of gene C are expressed. This observation could be explained by

a. a cis-epigenetic mechanism.

b. a trans-epigenetic mechanism.

c. DNA methylation.

d. both a and b.

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