STUDIES ON HIGH ANU LOW NON-DlSJUNC'l ION 



93 



only a piece Iroiii a j)oint between scute and ecliiniis iij) to a i)()int 

 J>etween Ian and forked originated Iroin an A'. 



Thus from culture 510 (table 9) there were taken 6 regular scute 

 females and crossed to l>ar males from stock (table 10). Of these sex 

 females four were of the ordinary A'A' type and from their offspring 

 there were taken sons of different constitution and crossed to high-non- 

 disjunctional females (from table 2) and to a scute eosin female from 

 culture :)31 (table 9). 



TABLE 10. 

 Offspring of regular scute feimiles from 510 table 9 when mated to Bar 



males from stock. 



In this way it was possible to obtain a number of non-disjunc- 

 tional lines, where other parts of the A' were common to the sex-chro- 

 mosomes of the females. 



A scute echinus cut male from 576 (table 10) was crossed to an 

 eosin female from 588 (table 1). This cross constituted culture 638 

 (table 2) and from this culture again a wild type daughter was mated 

 by an eosin vermilion forked* Bar male from stock (culture 661, 

 table 11). In this and the following cultures from table 11 the pieces 

 of the X which is common to both the A':s of the non-disjunctional fe- 

 males extends thus from a point between cut and vermilion to a point 

 to the right of forked. The percentage here was 15,58 + l,oi. 



Another scute echinus cut male from 544 (table 10) w^as crossed 

 to an eosin female from 588 (table l). From this cross (602, table 2) 

 a wild type female was taken (659, table 12) being the first of the two 

 cultures in table 12. Here too the part of X common to both A:s has 

 its limits between cut and vermilion and to the right of forked. The 

 percentage was 10,64 db 1,4 in a total of 517. 



