Fig 3. The dependance of the mean mRNA copy numbers $m_1^{*}$, $m_2^{*}$ and the ratio r* on the timing of gene duplication during S phase.

(A) The mean level $m_1^{*}$ stays nearly at a constant level, while $m_2^{*}$ decreases linear as the gene duplication time increases from 35 min to 53 min in S phase. (B) The ratio r* decreases almost linearly from 1.53 to 1.31 as the gene duplication time increases.