Polytene chromosomes normal.
Nucleotide substitution: C?T.
Amino acid replacement: Q218term.
C8678061T
C?T
Q218term | hry-PA; Q218term | hry-PB
Q218term
lethal
lethal | recessive
Weak h phenotypes show enhanced penetrance in embryos derived from mothers with only a single active copy of gro. A4 abdominal denticle belt of heterozygous h embryos from heterozygous gro mothers shows defects.
Class IV allele: has a strong segmentation phenotype either when homozygous or in trans with h25, and fails to complement the bristle phenotype of h1.
Nusslein-Volhard.