Developmental abnormalities in the embryonic period resulting from cobalt-60 induced mutations in Drosophila melanogaster are discussed. Embryos of 16 hours of development were studied. Among 32 abnormal embryos found in 52 eggs in this stock (Cnbw-16), eight having a consistent pattern of abnormality were studied. These embryos, designated as Cnbw-16, type a, all show a failure of embryonic shortening and midgut development. Associated abnormalities permit interpretation concerning the nature of normal development in three areas: (1) nerve cord condensation, (2) embryonic shortening, and (3) muscle fiber differentiation. Nerve cord condensation is partial in the absence of embryonic shortening. This indicates that this process is the result of two activities: the mechanical process of embryonic shortening and the process of cell differentiation. Embryonic shortening fails in the presence of partial or complete somatic muscle development. This observation supports the idea that embryonic shortening is independent of the development of the somatic musculature. Muscle differentiation is arrested at several different points. Observations indicate that fusion of myoblasts occurs independently, but that fiber formation depends upon a normal contact with the apodemes.
Proceedings of the Iowa Academy of Science
©1965 Iowa Academy of Science, Inc.
Reitan, Phillip J.
"An Analysis of Abnormal Development in the Cnbw-16 Stock of Drosophila melanogaster,"
Proceedings of the Iowa Academy of Science, 72(1), 486-493.
Available at: https://scholarworks.uni.edu/pias/vol72/iss1/69