rather novel mechanism for crossing over based on BELLING’S ideas A (1933)-was suggested by LINDEGREN and LINDEGREN (1937) and its implications were thoroughly discussed by SCHWARTZ ( 1954). It was proposed that crossing over of the usual type (between nonsister strands) takes place between only two of the four chromatids, presumably the newly synthesized ones. In order to explain the occurrenc...

in two days; This number of eggs therefore has not received the exposure necessary to produce the change in crossing over. The culmination of the two days exposure is to be expected in those eggs so situated that 125 to 175 eggs will be laid before them. Such an interpretation makes it extremely likely that the change in the amount of crossing over is finally affected in the earliest oocytes, t...

3 Let S be a set of n points in the plane and let R be a set of n pairwise non-crossing rays, 4 each with an apex at a different point of S. Two sets of non-crossing rays R1 and R2 are 5 considered to be different if the cyclic permutations they induce at infinity are different. 6 In this paper, we study the number r(S) of different configurations of non-crossing rays 7 that can be obtained fro...

The four methods of examining the relation of amount of multiple crossing over to age of mothers agree in showing that the "internode length" or average distance required for double crossing over has changed in a characteristic fashion, giving an M-shaped curve. These changes have not been independent of changes in total recombination but concomitant with them. However, the changes in recombina...

STUDIES on crossing over are usually designed to correlate changes in crossover values with a specific genetic or environmental condition. The lack of understanding of the primary genetic effects of chromosome rearrangements makes inferences based on the effects of these aberrations on crossing over difficult ( SUZUKI 1963b). On the other hand, extrinsic factors (temperature, radiation, chemica...

PAGE The problem.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 481 Material and methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 482 Genetic studies of crossing over. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 485 Cytological observations. . . . . . . . ....

In a total order of the vertices of a graph, two edges with no endpoint in common can be crossing, nested, or disjoint. A k-stack (respectively, k-queue, k-arch) layout of a graph consists of a total order of the vertices, and a partition of the edges into k sets of pairwise non-crossing (respectively, non-nested, non-disjoint) edges. Motivated by numerous applications, stack layouts (also call...

Very low birth weight (VLBW: ≤ 1500 g) individuals have an increased risk of white matter alterations and neurodevelopmental problems, including fine and gross motor problems. In this hospital-based follow-up study, the main aim was to examine white matter microstructure and its relationship to fine and gross motor function in 31 VLBW young adults without cerebral palsy compared with 31 term-bo...

We propose a level-crossing A/D (LCA/D) converter which can be modelled with an oversampling A/D followed by a low resolution quantizer. In this paper we will study the reconstruction of non-bandlimited inputs processed by such a system and compare its performance to uniform sampling. Index Termslevel-crossing sampling, MSE, Haar wavelets, bitrate.

We consider the crossing and non-crossing O(1) dense loop models on a semi-infinite strip, with inhomogeneities (spectral parameters) that preserve the integrability. We compute the components of the ground state vector and obtain a closed expression for their sum, in the form of Pfaffian and determinantal formulas.