Polymorphism specific genetic

Genetic control of D. melanogaster female components In 1989, Jallon and Pechine found a new type of quantitative hydrocarbon polymorphism specific to D. melanogaster females that affects the positions of double bonds in dienes. Although the double bonds remained at the same relative positions - separated by 2 carbons - they were more frequently located on carbons 5,9 in African flies and on carbons 7,11 in non-African flies. A study of 85 strains from around the world found the African type throughout the whole continent south of the Sahara Desert and in the West Indies and a small number of the Pacific islands. For example, the typical Tai females (Ivory Coast) has 30-40 percent 5,9-heptacosadiene (5,9-HD) and 2-6 percent 7,11-HD. Elsewhere... 

There is a large body of work on the genetics of systemic sclerosis (68). With the important caveat that autoantibody patterns appear to alter the chance of specific organ involvement, few studies have shown polymorphisms specific for pulmonary fibrosis in systemic sclerosis. Many studies have included too few... 

---