Written in English
|Statement||by Richard Charles Gethmann.|
|The Physical Object|
|Pagination||, 35 leaves, bound :|
|Number of Pages||35|
Crossing-over in a reversed acrocentric attached-X chromosome of Drosophila melanogaster. Beadle GW, Emerson S. Further Studies of Crossing over in Attached-X Chromosomes of Drosophila Melanogaster. Genetics. Mar; 20 (2)– [Europe PMC free article]  [Google Scholar]HANNAH A. Localization and function of heterochromatin in Drosophila by: 7. chromosome was the attached-X (reversed metacentric, in the descriptive termi- nology of NOVITSKI ). Another example of a compound X chromosome is the reversed acrocentric (RA). If a compound chromosome becomes involved in nonhomologom pairing, it is possible, at one extreme, that crossovers between elements of the compound pre-. Previous studies of reversed acrocentric compound-X chromosomes suggested peculiar influences of heterochromatin on both the synthesis and meiotic behavior of such compunds.
COINCIDENCE OF CROSSING OVER IN DROSOPHILA than would otherwise be the case. If, in the above example, the regions M N and P Q are not far apart, a break between M N will tend to prevent the occurrence of a break between P and Q (STURTEVANT , , MORGAN, STURTEVANT, MULLER and BRIDGES , pp. , MULLER ). This phenomenon, which has been termed File Size: 2MB. Abstract. Drosophila have two basic forms of chromosomes—mitotic and polytene—that have vastly different morphologies and cellular roles. Polytene chromosomes are found in interphase nuclei of differentiated cells, being especially prominent in certain tissues of the larva and adult by: 2. (A) Diagram of the karyotypes of normal and attached X females and the pattern of inheritance of the attachment. In an attached X female both normally acrocentric X arms are associated with a single centromere. Shown at the top is the normal karyotype, below that is an example of a Compound Reverse Metacentric [C(1)RM].Cited by: DROSOPHILA WITH TWO ATTACHED X CHROMOSOMES TABLE 1 Offsprtng of double-yellow females. PI F1 > xx Mate of Fx Y X from mother from mother?S x Patroclinous Gray 0 0 YellowcW Number $9 $ 0 0 Super-females 88' one detached detached X bb weCtf n 4 a Wild-type 71 0 1 wef n 0 n.. 1 n Wild-type 84 0 71 0 0 7s 1 Y brd 73 0 68 0 0File Size: 1MB.
L I T E R A T U R E CITED BEADL W. and S. EMERSON, G. Further studies of crossing over in attached-X chromosomes of Dromphila melanogaster. Genetics GRELL, F., a A new hypothesis on the nature and sequence of meiotic events in the feR. male of Drosophila melanogaster. THE MEIOTIC BEHAVIOR OF REVERSED COMPOUND RING X CHROMOSOMES IN DROSOPHILA MELANOGASTER L. Sandler reversed compound ring X chromosome is composed of two complete, or essentially complete, X chromosomes, each attached to the same centromere at one end (as in attached-X chromosomes) with the distal tips of the two chromosomes Author: L. Sandler. The Drosophila melanogaster Genetic Reference Panel (DGRP) is a community resource charting the molecular and phenotypic variation in fully sequenced fruitfly strains derived from a single. In order to test the influence of the proximal heterochromatin upon the induction of recombination in an adjacent euchromatic region, crossing-over experiments were carried out simultaneously with two types of Drosphila melanogaster female irradiated with X-ray doses ranging from 1 to 6 kR. Females of one of the genotypes (designated “N”) were heterozygous for a series of 3rd chromosome Cited by: 9.