Polytene chromosomes normal.
Amino acid replacement: W422term.
Point mutation causing truncation of the en gene product.
G11526406A
G?A
W422term | en-PA; W422term | en-PB
W422term
TGG to TAG
Strong allele.
Third thoracic denticle belt and first abdominal fuse, as do denticle bands A2 and A3, A4 and A5, and A6 and A7.
Male en6/en3 transheterozygotes have abnormal genitalia, with missing claspers, and a reduced genital arch process, hypandrium, hypandrial phragma and penis apparatus. Extra genital arch and anal plate bristles are sometimes seen. Female en6/en3 flies generally have extra bristles on the dorsal part of the eighth tergite, and fewer bristles on the ventral part of the eighth tergite.
Kornberg.