How can a plasmid cause a bacteria to go from yellow to BLUE or PINK or GREEN but only when arabinose is present

When arabinose is present in the environment, bacteria take it up. Once inside, the arabinose interacts directly with AraC, which is bound to the DNA. The interaction causes AraC to change shape, which in turn helps RNA polymerase bind the promoter, and the three genes araB, araA, and araD are transcribed.

Explanation:

this is true, assuming that the allele is completely recessive and incomplete dominance is not a factor.

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