a
genes 1 and 2 regulate the expression of gene 3.
The diagram illustrates the function of the master control gene.
The master control gene sends signals to other genes in a sequence of DNA. Based on this diagram, a change in the sequence of the master control gene could affect how
a
genes 1 and 2 regulate the expression of gene 3.
b
gene 4 regulates the master control gene.
c
gene 1 regulates the expression of gene 3.
d
genes 1 and 3 regulate the expression of gene 2.
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