J. W. H. Harrison 



71 r- 



TABLE III. 



Homozygous Melanic x Heterozygous Melanic (MM x Mm). 



Family 



N 

 O 

 P 



Q 



Parentage 



2Z)x (Ja 

 $a X ^E 

 $a X ^E 

 $a X ^E 



Males 



11 



18 

 20 



Melanics 



Females 



13 

 23 



18 



7 



Totals 



24 

 41 

 38 

 15 



Types 

 Males Females Totals 



Percentage 

 Melanic 



100 

 100 

 100 

 100 



Actually reared 

 Theoretical result 



118 

 118 



100 

 100 



The outcome of matings between typical homozygotes and melanic 

 heterozygotes appears in the following table : 



Once more the inheritance is on lines one would have anticipated 

 in broods proceeding from pairings between a homozygous recessive 

 type and a heterozygous melanic when the melanism in T. crepuscularia 

 behaved as a simple Mendelian dominant. 



Only two possible pairings remain for treatment, and those are 

 between homozygous black females and males of similar constitution 

 and the parallel matings when the insects concerned are types. 



TABLE V. 



Homozygous Melanic x Homozygous Mela/nic (MM x MM). ■ 



Family 



A 

 B 

 A' 

 B' 



Parentage 



Wild 

 Wild 



Ex J 



ExB 



A'^ xB' (J 



Melanics 

 Males Females Totals 



7 

 15 

 11 

 18 

 16 



11 

 16 

 14 

 20 

 13 



18 

 31 

 25 

 38 

 29 



Types 



^ -'- . Percentage 



Males Females Totals Melanic 



— — — 100 

 _ _ _ 100 



— — —100 

 _ _ _ 100 

 _ _ _ 100 



Actually reared 

 Theoretical result 



141 

 141 



100 

 100 



