METHODS OF KEEPING RECORDS 



525 



Fig. 73. Ledger page for a mutant stock. 





4* & 



4rj? 



f 



Pr.5 



+ ? 

 + ? 

 + ? 



vvxos 



BA /. 



rr 



?//>/s? 



n 



?i 

 fS 



n 



+ ++++ i^ 



+ + - 



S&786 x v<? 



*■ ♦ + ♦ pr- 



6 & ?/x>/sy 



Ra4g i 



97 



t£ia 7 



?V?8SXlt 



7L 1/39/sr? 



98 



+ ?> A»- // 



/A 'o/v/i? 



9V 

 /0/ 





ctK 





r ++ 



■*■+■*■ f , 



■r 



<TA /o/is/sf 



00 

 07 



An example of a ledger page for a mutant stock showing the arrangement of columns 

 on the page, and classification (phenotypes) of mice in several litters, their fates, and the 

 genotypes of the parents. (Note that + is used to designate wild type or normal allele of 

 any of these mutants.) 



The Pedigree Card. — The pedigree card may be designed to suit the needs of the 

 investigator. It should include space for the following information: date of birth, 

 date of death, age at death, the kind of animal (strain or stock), the generation, the 

 individual identification number, location (pen), date of birth of all litters, numbers 

 born, number and sex of mice weaned and their fate (ledger number or a note if killed 

 without pedigree) (figure 74AandB). In large colonies it is more efficient to have 

 the headings on the pedigree card and in the ledger read across the card and page in the 

 same order. It is also essential to have space on the card for the date of mating, the 



