Table 1.

Depletion of Umbrea causes polytene chromosome telomere-telomere attachments

Genotypes	n	n*	Attached telomeres per nucleusa,b
			0	2	2+2	3	3+2	4	5
G61/+; 13072/+	6	306	173 (56.5%)	104 (34%)	6 (2%)	20 (6.5%)	1 (0.3%)	1 (0.3%)	1 (0.5%)
G61/G61	5	298	237 (80%)	51 (17%)	1 (0.3%)	9 (3%)	0	0	0
G61/+	8	347	297 (86%)	46 (13%)	2 (0.6%)	1 (0.3%)	0	0	0
Wild-type (Kochi-R)	5	410	397 (97%)	13 (3%)	0	0	0	0	0

n, number of animals tested.

n*, number of nuclei examined.

^aThe five arms (chromosome arm 2L, 2R, 3L, 3R, and the X chromosome) of polytene chromosomes were examined for telomere–telomere attachment events. Note, the small fourth chromosome was not taken into account.

^bAttached telomeres per nucleus:

0 Nuclei of this class display no telomere attachments. The five arms of polytene chromosomes are free and can be distinguished.

2 This class includes the attachment of two telomeres. Three chromosomal arms are free.

2+2 This class includes double telomere attachment events. Twice, two telomeres are independently attached. One chromosomal arm is free.

3 This class includes a triple telomere attachment. Three telomeres are attached, forming a single structure. Two chromosomal arms are free.

3+2 This class includes a triple telomere attachment and the association of two telomeres. No chromosomal arms are free.

4 This class includes the attachment of four telomeres forming a single structure. One chromosomal arm is free.

5 This class includes the attachment of all five polytene chromosomes. No chromosomal arm is free.