000			02346nab a22003257a 4500
001			G68798
003			MX-TxCIM
005			20221216150540.0
008			121211b |||p||p||||||| |z||| |
022			_a0011-4545
022			_a1348-7019 (Online)
024			_2https://doi.org/10.1508/cytologia.27.248
040			_aMX-TxCIM
041			_aeng
090			_aREP-1128
100	1		_aMaguire, M.P. _929463
245	1	0	_aVariability in length and arm ration of the pachytene chromosomes of corn
260			_c1962. _aTokyo (Japan) : _bJapan Mendel Society,
340			_aPrinted
500			_aFree Access
520			_aAbsolute length measurements are reported for all chromosomes of 271 pachytene microsporocytes from 89 anthers of 31 related corn plants. Arm ratios are reported for all of these chromosomes where it was possible to locate the centromere. Data are compared to previously published measurements of corn chromosomes. Sample variances and coefficients of variation of chromosome lengths and arm ratios are compared. The results include findings that longer chromosome arms have greater variances but smaller coefficients of variability and that chromosomes with larger arm ratios have inherently more variable arm ratios. These greater variabilities in arm ratio were not correlated with corresponding greater variabilities in length of the chromosomes involved. All results are consistent with the interpretation that the chromosomes have two kinds of variability: one which seems to contribute approximately uniformly per unit length to variability throughout the genome while the other kind of variability may be a characteristic property of each chromosome unrelated to length in any consistent way. Chromosome knobs do not appear to influence variability in length of chromosome arms in which they occur. Tripsacum chromosome material does not appear to differ in its length variability from corresponding corn chromosome material for which it has been substituted.
546			_aText in English
595			_aRPC
650		7	_2AGROVOC _97014 _aChromosomes
650		7	_2AGROVOC _91173 _aMaize
650		7	_2AGROVOC _99988 _aTripsacum
650		7	_2AGROVOC _92624 _aStatistical methods
773	0		_tCytologia _gv. 27, no. 3, p. 248-257 _dTokyo (Japan) : Japan Mendel Society, 1962. _wG444258 _x0011-4545
942			_cJA _2ddc
999			_c19466 _d19466