STUDIES OF INHERITANCE AND EVOLUTION 

 IN ORTHOPTERA. IV\ 



MULTIPLE ALLELOMORPHISM AND INHERITANCE OF 

 COLOR PATTERNS IN TETTIGIDEA^. 



By ALBERT WILLIAM BELLAMY. 

 (With Plate III.) 



Introduction. 



According to Bateson each character of an alternative pair is an 

 allelomorphic one. He says ('09, p. 11) "The dissociation of characters 

 from each other in the course of the formation of the germs, we speak 

 of as segregation, and the characters which segregate from each other 

 are described as allelomorphic, i.e. alternative to each other in the 

 constitution of the gametes." 



According to Morgan, allelomorphic characters are characters, the 

 determiners for which have identical loci in homologous chromosomes. 

 Shull ('15, p. 55) speaks of allelomorphism as " A relation between two 

 characters such that the determiners of both do not enter the same 

 gamete, but are separated into sister gametes." If instead of a single 

 pair, a series of several characters exists, each of which behaves towards 

 another as one of an alternative pair, it is said to constitute a system of 

 multiple allelomorphs ; the relation of the characters to one another 

 being known as multiple allelomorphism. 



Triple systems of allelomorphs have been described in rats, guinea- 

 pigs, rabbits, Drosophila, beans, snapdragons, Lychnis, et al. Quadruple 



^ Studies I, II and III of this series were published by Robert K. Nabours, Journal of 

 Genetics, Vols. iii. and vii. 



•^ Contribution from the Zoological Laboratory of the Kansas State Agricultural College 

 and Experiment Station, No. 12. 



