GENE MUTATIONS 



TRANSPARENT, tp (eyes). This is an eye muta- 

 tion in which the compound eyes have a trans- 

 parent appearance. It shows up only with light 

 eye colors. It is female fertile, and the males 

 are of normal viability. Several recurrences 

 of this mutation occurred in the summer of 1945. 



LIGHT-OCELLI, lo (eyes). This mutant appeared 

 in the summer of 1934 in the offspring of an 

 X-rayed female (dosage about 5000 R units). 

 Here normal wild-type black compound eyes are 

 accompanied by light ocelli. This mutant was 

 not allelic with orange, and both sexes were 

 found to be fertile. (Discarded) 



PORT, pt (eyes). This mutant appeared in the 

 summer of 1934 in the offspring of an X-rayed 

 female (dosage about 4500 R units). Here com- 

 pound eyes are of a dark red color with light 

 ocelli. In this mutant the males appeared to 

 be sterile, and it was lost immediately after 

 appearance. 



The several cases of eye-color "mimics" are 

 of some interest. White and ivory are indis- 

 tinguishable except under a high magnification, 

 when it can be observed that white is more 

 translucent than ivory. Both have a slight 

 greenish tinge. Carrot is somewhat more pink 

 than orange although very similar to it, while 

 dahlia and maroon resemble each other v/ith dah- 

 lia tending on the average to be lighter. Any 

 two of these "mimics" crossed together recon- 

 stitute the dominant in the Fl females. 



Multiple recessives are as light as or 

 lighter than any single mutant type entering 

 into their genetic constitution. In the major- 



