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Table 2 The speed of Muller’s ratchet under obligate asexuality, assuming fixed population size N = 103 individuals and deleterious mutation rate U = 1.116. n0 = Number of individuals within the least-loaded class, s = selection coefficient, t(J) = interclick time estimate based on Eq. 34 in [28], t(NS) = interclick time estimate based on Eq. 33 in [29] and t(ME) = interclick time estimate based on Eq. 24 [30]; all time estimates are given as numbers of generations per “click”. Bold text = estimates of the selection coefficients of the fastest ratchets; the (J)-value was computed according to Eq. 34 in [28], corresponding to a U-shaped function with a local minimum at s = 0.212, which we considered as a critical value of the fastest ratchet acting on sporophytes

From: A little bit of sex prevents mutation accumulation even in apomictic polyploid plants

s

n 0

t (J)

t (NS)

t (ME)

0.340(ME)

38

6649

3008

3570

0.218(NS)

6

33

32

14,006

0.212(J)

5

33

32

16,146