Heterozygotes have denticles that are smaller, thinner and more variable in size and shape than those in wild type. Hairs appear normal.
Sbsbd-1, Sbsbd-2 and Sbsbd-207 have much milder phenotypes than other 'sbd' alleles. They are viable and not malformed as homozygotes.
Sb1/Sbsbd-2 are more extreme than Sb1/+. Sbsbd-2, Sb1 behaves as a recessive 'sbd' allele but is homozygous lethal; rare escapers more extreme and easy to recognize.
homozygous viable Most bristles about three-fourths normal length although some (i.e., posterior postalars) are shorter. Less extreme than Sbsbd-1. Sbsbd-2/Sb1 has shorter bristles than homozygous Sbsbd-2 or Sb1/+. Sbsbd-2 Sb1/+ + has wild-type bristles (Lewis, 1951). RK1.