000			01624nab a22002777a 4500
001			G99090
003			MX-TxCIM
005			20211006085018.0
008			121211b |||p||p||||||| |z||| |
022			_a1095-9203 (Revista en electrónico)
022	0		_a0036-8075
024	8		_ahttps://doi.org/10.1126/science.222.4626.886
040			_aMX-TxCIM
041	0		_aEn
100	1		_aIltis, H.H.
245	0	0	_aFrom Teosinte to maize: _b the catastrophic sexual transmutation
260			_c1983
520			_aAn alternative to the theory that the ear of maize (Zea mays ssp. mays) evolved from a slender female ear of a Mexican annual teosinte holds that it was derived from the central spike of a male teosinte inflorescence (tassel) which terminates the primary lateral branches. This alternative hypothesis is more consistent with morphology and explains the anomalous lack of significant genetic and biochemical differences between these taxa. Maize, the only cereal with unisexual inflorescences, evolved through a sudden epigenetic sexual transmutation involving condensation of primary branches, which brought their tassels into the zone of female expression, leading to strong apical dominance and a catastrophic shift in nutrient allocation. Initially, this quantum change may have involved no new mutations, but rather genetic assimilation under human selection of an abnormality, perhaps environmentally triggered.
546			_aEnglish
593			_aCarelia Juarez
595			_aRPC
650	1	7	_aMaize _gAGROVOC _2 _91173
653	0		_aTeosinte
773	0		_tScience _gv. 222, no. 4626, p. 886-894
942			_cJA
999			_c30599 _d30599