Table 1.

Average selective effect estimates (s) based on competitive fitness, average selective effect scaled by generation time (s_τ) per mutation, selective effect per mutation based on growth rates and scaled selective effect based on growth rate (Morgan et al. 2014) ± standard errors, by genetic background and across all MA backgrounds

Ancestral genotypes	Number of MA lines	s per mutation (competitive fitness)	sτ per mutation (competitive fitness)	s per mutation (growth rate)	sτ per mutation (growth rate)
CC‐1952	13	0.0000732 ± 0.0000977	0.000775 ± 0.00143	0.00126 ±0.000358	0.00609 ±0.00177
CC‐2342	10	0.000393 ± 0.000224	0.00481 ±0.00281	0.000984 ±0.000535	0.00429 ±0.00248
CC‐2344	12	0.000165 ± 0.0000949	0.00193 ±0.00134	0.000406 ±0.000258	0.00258 ±0.00165
CC‐2931	11	0.000119 ± 0.0000235	0.00144 ±0.000305	0.000229 ±0.0000465	0.00101 ±0.000216
CC‐2937	14	–0.000151 ± 0.0000859	–0.00340 ±000176	–0.000487 ±0.000162	–0.00589 ±0.000137
All backgrounds	60	0.000101 ± 0.0000542	0.000827 ±0.00800	0.000447 ±0.000154	0.00115 ±0.000896