ADDITIONAL DATA FOR THE STUDY OF SEX- 

 LINKED INHERITANCE IN DROSOPHILA 



T. H. MORGAN and ELETH CATTELL 



From the Deparlmcnl of Zoology, Columbia University 



In a paper dealing with Data for the Study of Sex-hnked 

 Inheritance in Drosophila (Jour. Exp. ZooL, voL 13, no. 1, 1912) 

 we described seven crosses in which three pairs of the sex-hnked 

 factors were involved. Three crosses that belonged to the same 

 series were withdrawn because, as stated, the results were anom- 

 alous in certain points. It seemed almost certain that an error 

 had crept in somewhere. The new results show, in fact, that 

 these crosses are consistent with the other results concerning eye 

 color, body color and wing characters. The new data, added 

 to those of our former paper, to those of Morgan's paper for 

 1911, and to those of Dexter's paper that has just appeared, 

 give numbers large enough to show the 'coupling strength' of 

 some of the factors involved. 



THE HEREDITY OF THREE CONTRASTED SEX-LINKED 

 CHARACTERS 



In the. former paper (page 89) the second, third, and fourth 

 combinations were the ones omitted. They are given here in 

 sequence. The same symbols are used and the same method 

 employed in writing out the analyses that were used before. 



Short, red, black by long, white, yelloiv 



This is the reciprocal of the cross already pubhshed (1912, 

 page 90). When the female, LWY is mated to the male SRB 

 all the female offspring are long, red, gray and all the males 

 long, white, yellow. The numerical results for this and the F2 

 generation are as follows: 



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THE JOURNAL OP EXPERIMENTAL ZOOLOGY, VOL. 14, NO. 1 



