Drosophila Melanogaster. 
309 
Table XIV. Hybird 2 (vestigial 9 by curved ) by curved &. 
Number 
Wild type 
Curved 
os oh 
Be 
ouret 
2 
14 
18 
32 
39 
Table XV. Hybrid & (vestigial 2 by curved &) by curved @. 
Number 
Wild type 
Curved 
wey 
Dye 
Suc 
68 
43 
118 
It is evident that in order to bring out the linkage value the double reces- 
sive vestigial curved should be used in the back crosses. 
V. Behavior of curved with crosses involving black. 
Chromosome II. 
Black, a body color mutation, was found by Morgan. Its linkage shows it 
to belong to Group II. The contrast between the two characters makes 
black a good character against which to test curved. 
1. Black @ by curved qo. 
The gray (wild type color) curved .» mated to the straight (wild type 
wing) black g gave 12 wild sons and 13 wild daughters. These inbred pro- 
duced an F, generation classified in table XVI. 
