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. 2009 Nov 24;4(11):e7987. doi: 10.1371/journal.pone.0007987

Table 1. Sex and genotype ratios of Sdhd KO mice.

129P2/Ola F1*
Male Female +/+ +/−
n =  106 82 85 93
Ratio 1.3∶1.0 0.9∶1.0
*

not all mice could not genotyped.

Sex and genotype ratios of the offspring of +/− mice backcrossed with wildtype mice of the 129P2/Ola and C57BL/6J genetic backgrounds are normal. Absence of live homozygous offspring from the crossing of heterozygous mice (129P2/Ola +/−×+/−) indicates that homozygous loss of Sdhd is not compatible with life.