ALLKN. — THE HEREDITY OF COAT COLOR IN MICE. 



05 



TABLE K. 



(Based on observations of Parsons and Copenian.) 



lished from which it i.s possible to obtain stati.stical proof of the validity 

 of Mendel's laws among mice. 



In three recent [tapers, Darbishire (: 02, : 03, ; 03^) has summarized 

 certain of his results in crossing spotted "fawn-white" Japanese waltz- 

 ing mice with albino mice, and these observations, too, confirm the law 

 of segregation, in that the crosses show complete albinism to be inherited 

 in the proper Mendelian proportions. In the first cross of the two stocks, 

 only heterozygotes resulted in accordance with formula (1). In his 

 second paper (: 03) the results of intercrossing these heterozygotes are 

 given, and it is stated that in a total of 6() young, 13 are albinos, where 

 1 G.o are expected ; 225 young are obtained by back-crossing heterozygotes 

 with albinos, and of these 119 are albinos, the expectation being 112.5. 

 The total number of albinos is thus 132, where the expectation is 129. 

 Ilence a fairly close agreement is shown. This author's final report is 

 awaited with interest, and is expected to shed further light on questions 

 of Mendelian inheritance. 



Finally, Bateson (:03''), in a discussion of color hennlity among rats 

 and mice, adduces 50 matings of mice, contributed by Mr. F. J. Parsons 



