Table 1.

Mendelian ratio of mouse pups at birth

Rpl5+/+, nRpl5+/−, nRpl5+/−, %
Genotyped pups (n = 58)    
 Observed 40 18 31 
 Predicted 29 29 50 
Pups followed up (n = 13)    
 Died before weaning, n 60 
 Survived past weaning, n 40 
Rpl5+/+, nRpl5+/−, nRpl5+/−, %
Genotyped pups (n = 58)    
 Observed 40 18 31 
 Predicted 29 29 50 
Pups followed up (n = 13)    
 Died before weaning, n 60 
 Survived past weaning, n 40 

WT x Rpl5+/− matings were performed, and 14 litters were genotyped (n = 58 pups). The percentage of Rpl5+/− offspring was significantly lower than the Mendelian prediction. χ2 analysis (P = 0.0039). Three litters (n = 13; WT, n = 8; Rpl5+/−, n = 5) were followed up to determine the percentage of newborn pups that died after birth and before weaning. Three of 5 mutant pups (60%) died before weaning: 2 pups on day 1 and 1 pup on day 21.

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