Polytene chromosomes normal (Slizynska).
Some eggs collapse soon after deposition, others fail to differentiate cuticular structures derived from the anterior and posterior regions of the egg.
Maternal lethal. Developmental study of fs(1)N1 by Counce and Ede. Eggs of fs(1)N1/fs(1)N1 females will not support development of normal embryos. About half the eggs contain little or no yolk; development may or may not begin in such eggs but never progresses beyond a highly abnormal cleavage. In eggs containing more yolk, major effect is on synchrony of cleavage and blastoderm mitoses. Twenty percent of these embryos cease development before blastoderm formation. The remainder have abnormal blastoderms and aberrant gastrulation. Final pattern of damage determined by degree of abnormality of earlier stages, but some embryos show larval differentiation. A few of the least abnormal embryos may emerge but never move about or feed. Formation of polar granules abnormal. RK3.
fs(1)N1 is an enhancer of visible phenotype of Ppt1UAS.cKa, Scer\GAL4GMR.PF
fs(1)N1 is an enhancer of eye phenotype of Ppt1UAS.cKa, Scer\GAL4GMR.PF
Nasrat, 1952.