. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 366 C. D. DARLINGTON The terminalization of the chiasmata in the short chromosomes is therefore very like that in the fragments of Fritillaria imperialis where all chiasmata are terminalized early although only the distal chiasmata move to the end in the major chromosomes with numerous chiasmata (Darlington, 1930). X5 O ja. a o c 'I _Q s. ORIGIN MID- (LATE DIA- META- OF CHIASMATA DIPLOTENE DIPLOTENE) KINESIS PHASE FIG. 17. Graph showing that the increase in the numbers of terminal chias- mata is in proportion to the
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 366 C. D. DARLINGTON The terminalization of the chiasmata in the short chromosomes is therefore very like that in the fragments of Fritillaria imperialis where all chiasmata are terminalized early although only the distal chiasmata move to the end in the major chromosomes with numerous chiasmata (Darlington, 1930). X5 O ja. a o c 'I _Q s. ORIGIN MID- (LATE DIA- META- OF CHIASMATA DIPLOTENE DIPLOTENE) KINESIS PHASE FIG. 17. Graph showing that the increase in the numbers of terminal chias- mata is in proportion to the total number at all stages where more than two are formed but not in the earlier stages where only one is formed. The short chromo- some type and the late diplotene stage are omitted because the numbers of observa- tions are smaller than those given. SUMMARY 1. A study of meiosis in male Chorthippus clegans, Acrididse (2n = 16(-|-X) shows the chromosome behaviour to be similar to that al- ready described in Stenobothrus parallelus. Thus the chiasma fre- quency is an indirect function of length and has an interference curve of variation. Failure of pairing occurs in one chromosome type with a frequency in keeping with the curve. Terminalization depends entirely on the generalized repulsion in bivalents with closed loops and the lo- calized spindle attachment repulsions are of the minimum degree found in Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Marine Biological Laboratory
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