Duplication of the Nap1 gene, with each copy containing a frameshift mutation, so that both should be non-functional. A w+mW.hs marker is present between the two copies.
lethal
partially lethal - majority die
Homozygotes have a low rate of survival to adulthood.
Dp(3;3)Nap1KO2 homozygotes have a low rate of survival to adulthood.