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The numbers of euchromatic copies of members of each family were determined for each line by<jats:italic>in situ<\/jats:italic>hybridization of element probes to polytene chromosomes. Heterochromatic numbers were estimated by subtraction of the euchromatic counts from the total numbers. There was considerable variation between element families and lines in heterochromatic abundances, and the variance between lines for many elements was much greater for the heterochromatin than for the euchromatin. The data are consistent with the view that much of the \u03b2-heterochromatin consists of sequences derived from transposable elements. They are also consistent with the hypothesis that similar evolutionary forces control element abundances in both the euchromatin and heterochromatin, although amplification of inert sequences derived from transposable elements may be in part responsible for their accumulation in heterochromatin.<\/jats:p>","DOI":"10.1017\/s0016672300032845","type":"journal-article","created":{"date-parts":[[2009,9,17]],"date-time":"2009-09-17T07:25:09Z","timestamp":1253172309000},"page":"183-197","source":"Crossref","is-referenced-by-count":74,"title":["The distribution of transposable elements within and between chromosomes in a population of<i>Drosophila melanogaster<\/i>. III. 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