No. 640] SHORT EARS IN THE HOUSE MOUSE 



d'd' 9 9; Recorded i & - 



1655a-l.. 

 1655b-2. . 



carried by the single X chromosome and distributed only 

 to his daughters, which wbuld have long ears. His sons 

 would not receive it; therefore they all would be short- 

 eared like the maternal parent. 



The offspring from this cross are listed in Table II. 

 In a few cases the mice escaped or were destroyed by the 

 parents before the sex was recorded. There were, in ad- 



