FLP detection of InDels of various sizes in homozygotes and heterozygotes. In each panel the top two graphs show the homozygotes and the bottom graph the heterozygote. Gray shaded areas mark the defined expected allele lengths and red lines indicate the borders of a predefined window of expected allele lengths. (a-c) Detection of InDels in C. elegans that show increasing levels of adenosine (A) addition. (a) 3-bp InDel ZH1-01 with no A addition; (b) 12-bp InDel ZH2-01 with A addition; (c) 2-bp InDel ZH3-05a with A addition. (d) 1-bp InDel ZH3-23 in C. elegans with A addition. An unambiguous allele-call can be made, irrespectively of the level of A addition: both homozygous samples consist of two peaks at different positions, whereas the heterozygous animal exhibits three peaks. (e) The 1-bp InDel 3R160 in Drosophila runs over a 12-13 nucleotide poly(T) stretch and exhibits stutter bands. Even in this case, a clear allele-call can be made (three peaks in homozygous and four peaks in heterozygous animals). (f) The 6-bp InDel ZHX-22 in C. elegans occurs in a poly(C) stretch and the FLP graph displays stutter bands. As expected, the longer fragment exhibits a higher degree of stuttering.