Filicidal Ring-Y Chromosomes in D. MELANOGASTER |
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Authors: | James C. Stone |
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Affiliation: | Department of Biology, University of Oregon, Eugene, Oregon 97403 |
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Abstract: | Ring-Y chromosomes are recovered infrequently from crosses of ring-Y-bearing males to females of certain strains (Oster 1964). Experiments described here have unveiled a diverse class of genes that exert a maternal effect on the behavior during cleavage of these "filicidal" ring chromosomes. Cytological observations of inviable embryos have revealed that the ring-Y chromosome causes gross disorganization of the cleavage nuclei. This inviability may be equivalent to the "dominant lethality" attributed to unstable ring-X chromosomes (Hinton 1955; Pasztor 1971). Mapping studies indicate that no single region of the normal Y is solely responsible for the unusual behavior of ring-Y chromosomes. |
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