The typical reference that you mention when writing that 10% of the Drosophila
genome is mainly composed of middle repetitive DNA is the following:
Young, M.W. (1979) Proc Acad Sci USA 76:6274-6278.
But, to be sincere, I have never read it.
Regarding your other question, different species have typical proportions and
types of transposons. In humans the typical transposons are LINE and SINE
(Alu) elements, in a number much higher than the Drosophila elements and quite
stable in their insertion site. In fact some particular Alu insertions are
conserved between human and chimpanzee.
Maximo Ibo Galindo (m.galindo at rhbnc.ac.uk)
Royal Holloway, University of London
School of Biological Sciences
Egham, Surrey TW20 OEX
TEL: (44) 1784 443 954 or 443 186
FAX: (44) 1784 470 756