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E C O N O M I C SWorking Paper 99-0
Page 3 and 4:
CIMMYT (www.cimmyt.mx or www.cimmyt
Page 5 and 6:
Executive SummaryThis paper summari
Page 7 and 8:
AcknowledgmentsAny report that is b
Page 9 and 10: followed a very different path comp
Page 11 and 12: Farmers’ Management of Maize Vari
Page 13 and 14: In recent years, new evidence has e
Page 15 and 16: state of Guanajuato and discusses t
Page 17 and 18: Based on the results of a survey co
Page 19 and 20: elied with greater frequency on the
Page 21 and 22: hybrid seed. Initially, it was gene
Page 23 and 24: In Veracruz State, Mexico, where mo
Page 25 and 26: Recent work in the highlands of Mex
Page 27 and 28: producers) tend to rely on family,
Page 29 and 30: Unintentional seed mixingUnintentio
Page 31 and 32: Table 11. Yield depression resultin
Page 33 and 34: Genetic driftWhen farmers select ea
Page 35 and 36: (a) Production of a single-cross hy
Page 37 and 38: Breeding hybrid maize begins with t
Page 39 and 40: According to this theory, genes tha
Page 41 and 42: Wright’s finding, which is based
Page 43 and 44: Similarly, the mean of F3 generatio
Page 45 and 46: 2. Between the F1 and F2 generation
Page 47 and 48: In a series of on-station trials co
Page 49 and 50: As part of the same trial, Ramírez
Page 51 and 52: Table 19. Inbreeding depression obs
Page 53 and 54: to 41% for the single cross (Figure
Page 55 and 56: DiscussionEvery time a farmer recyc
Page 57 and 58: The finding that genetic change in
Page 59: Brennan, J.P., and D. Byerlee. 1991
Page 63 and 64: AppendixGuidelines for Estimating t
Page 65 and 66: exactly how different the plants wo
Page 67 and 68: As a general rule, we propose that
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