Figure 5.—

R2 insertions and deletions rapidly accumulated in line 58. Single pairs of flies from line 58 were mated and their progeny were maintained as separate lineages for five generations. Data from two lineages are presented. Shown at the top of A and B are the R2 profiles of the two X chromosomes from the original female and the single X chromosome from the original male used to establish the lineage. The profiles of the two X chromosomes of the female were determined by analysis of the R2 profiles of a collection of her sons. Below these progenitor profiles are the profiles of males collected at the fifth generation. The dotted line to the left of each R2 5′-truncation profile represents an expanded scale of differences in the full-length R2 elements. Because there are many full-length R2 elements, only full-length elements not present in parental X chromosomes are shown. New R2 insertions are in bold and marked with a star. Deletions of the parental R2 copies are marked by solid ovals. Numbers on the right are the number of generation 5 males in which this profile type was found.