Polytene chromosomes normal.
Amino acid replacement: P483S. Nucleotide substitution: C?T.
C5818188T
C?T
P484S | vn-PA; P484S | vn-PC
P483T
Temperature-sensitive allele.
Individuals transheterozygous with a strong EMS vn mutation at 20oC exhibit held out wings, at 27oC individuals are prepupal lethal with notumless wing discs.
Heteroallelic combinations cause smaller wings, in addition to gaps in wing veins.
temperature-sensitive allele
Shearn.