478 



GENETICS 



i 



1 



00 



B 



Fig. 255. — Results of mono-hybridization of Drosophila which differ with 



respect to type of wing. The chromosomes are shown as the carriers of the 



genes. V is the symbol used for the gene for long wing which is dominant to 



a gene, indicated by v, for vestigal wing (cf. Fig. 252). 



(From Morgan, et al., "The Mechanism of Mendelian Heredity," copyright, 1922, by 

 Henry Holt and Co., reprinted by permission.; 



