000			02211nab a22003617a 4500
001			G80421
003			MX-TxCIM
005			20211006080531.0
008			121211b |||p||p||||||| |z||| |
022	0		_a0016-6731
040			_aMX-TxCIM
082	0	4	_a92-103876
100	1		_aCarlson, W.R.
245	0	0	_aA new property of the maize B chromosome
260			_c1992
340			_aPrinted
500			_aPeer-review: Yes - Open Access: Yes|http://science.thomsonreuters.com/cgi-bin/jrnlst/jlresults.cgi?PC=MASTER&ISSN=1943-2631
500			_areferences US (DNAL 442.8 G28)
520			_aTB-9Sb is a translocation between the B chromosome and chromosome 9 in maize. Certain deletions of B chromatin from the translocation cause a sharp decrease in B-9 transmission compared to the rate for standard TB-9Sb. The deletions remove components of a B chromosome genetic system that serves to suppress meiotic loss in the female. At least two distinct B-chromosome regions suppress meiotic loss: one on the B-9 and one on 9-B. The system operates by stabilizing univalent B-type chromosomes. It allows the univalents to migrate to one pole in meiosis, despite the absence of a pairing partner. The findings reported here are the first evidence for genetic control of meiotic loss by a B chromosome. However, it is proposed that the practice of suppressing meiotic loss is common to the B chromosomes of all species. The need to suppress meiotic loss results from the fact that B chromosomes are frequently unpaired in meiosis and subject to very high frequencies of loss. B chromosomes may utilize one or more of the following methods to suppress meiotic loss: (a) regular migration of univalent B's to one pole in meiosis, (b) enhanced recombination between B chromosomes and (c) mitotic nondisjunction
546			_aEnglish
595			_aAC
650	1	0	_aBiological development
650	1	0	_aCell division
650	1	0	_aCell structure
650	1	0	_aGramineae
650	1	0	_aNucleus
650	1	7	_aPlant genetics and breeding _gNOT IN AGROVOC _2 _91208
650	1	0	_aRecombination
650	1	0	_aZea
700	1		_aRoseman, R.R., _ecoaut.
773	0		_tGenetics _gv. 131, no. 1, p. 211-223
942			_cJA
999			_c24936 _d24936