. 2017 May 31;13(5):e1006827. doi: 10.1371/journal.pgen.1006827

Table 2. Observed and expected nonexchange chromosomes.

Genotype	Chiasmata	P(k = 0)^*	Meiocytes (n)	E0_exp^†	E0_obs
WT	10	0.14	52	36	0
atrad51^-/+ atrad51c^-/+ atxrcc3^-/+	7	0.25	15	19	0

*P(k) = (λ^ke^-λ)/k!

† E0_exp = P(k = 0) * n * 5 (number of bivalents per meiocyte)