COMPOUND CHROMOSOMES INVOLVING THE X AND Y CHROMOSOMES OF DROSOPHILA MELANOGASTER

Spontaneous formation of compound X chromosomes in Drosophila melanogaster.

Males carrying different X chromosomes were tested for the ability to produce daughters with attached-X chromosomes. This ability is characteristic of males carrying an X chromosome derived from 59b-z, a multiply marked X chromosome, and is especially pronounced in males carrying the unstable 59b-z chromosomes Uc and Uc-lr. Recombination experiments with one of the Uc-lr chromosomes showed that...

The Compound X Chromosomes in Drosophila.

HROMOSOMES formed by the union of homologous elements provide C a situation in which somewhat more can be learned about the nature of the meiotic phenomena in Drosophila than may be deduced from a study of normal chromosomes. The classic example is, of course, the attached X chromosome; there are, however, five other types of compound X chromosomes theoretically realizable. All five are now kno...

Distributive Pairing of Compound Chromosomes in Females of Drosophila Melanogaster.

HE relation between crossing-over and disjunction in the Drosophila female Thas been studied for many years. ANDERSON (1929), DOBZHANSKY (1932, 1933), BROWN (1940), PIPKIN ( 1940) and others clearly demonstrated that crossing-over has a strong influence on disjunction in translocation heterozygotes. The reciprocal products of an exchange tend to pass to opposite poles of the first meiotic divis...

Interchange between X- and Y-Chromosomes in Attached X Females of Drosophila Melanogaster.

Polytenization of the ribosomal genes on the X and Y chromosomes of Drosophila melanogaster.

It has previously been shown (Endow and Glover 1979), that polytenization of the ribosomal genes in D. melanogaster Ore-R X/Y cells and in hybrid X/X cells (Endow 1980) involves replication of genes predominantly from one of the cell's two nucleolus organizers. This analysis takes advantage of strain-specific differences in X and Y chromosome rDNA hybridization patterns detected using the South...