OF MUTANT CHARACTERS. 



259 



In the spring of 1915 Morgan also found fringed, probably through 

 use of the same wild stock from which it originally came in the cross 

 to jaunty I. 



TABLE 105. PI, fringed d" X black 9 ; FI mid-type 9 + FI wild-type d" . 



TABLE 106. Pi, fringed <? X speck 9; FI wild-type 9 + FI wild-type d*. 



TABLE 107. PI, star 9 X black fringed d" ; B. C., FI star 9 X black fringed d". 



STAR (5'). 



(Text-figure 83.) 



ORIGIN OF STAR. 



In an experiment by means of which it was proved that the excep- 

 tional sons produced through secondary non-disjunction are them- 

 selves unable to transmit the power of producing further secondary 

 exceptions (Bridges, 1916, p. 44), an eosin sable forked male was 

 found which had an eye of the moruloid type and which was very 

 similar in appearance to the sex-linked mutation " facet" (culture, 

 1347, February 12, 1915). 



INHERITANCE OF STAR. 



It was assumed that this character was sex-linked, since it had ap- 

 peared in a single male in a pair culture, as is usual with sex-linked 

 mutations. For this reason the matings for F 2 were made without 



