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Registro Completo |
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Biblioteca(s): |
Embrapa Milho e Sorgo. |
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Data corrente: |
11/09/1997 |
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Data da última atualização: |
19/07/2018 |
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Autoria: |
VELLO, N. A.; VENCOVSKY, R. |
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Título: |
Ganho genético esperado com seleção dentro de progênies e recombinação por policruzamentos. |
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Ano de publicação: |
1982 |
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Fonte/Imprenta: |
In: CONFERÊNCIA INTERNACIONAL DE BIOMETRIA, 10., 1979, Guarujá. Anais. Brasília: EMBRAPA-DID, 1982. p. 522-531. |
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Idioma: |
Português |
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Conteúdo: |
Expected genetic gain in breeding programs that imply within-progenie selection followed by recombination through polycrossing. Expression are developed in this study for predicting genetic gain in breeding programs that are based on within progeny selection followed by recombination through polycrossing. Expressions for variances and covariances are obtained by considering two populations with different gene frequencies, both in hardy-Weinberg equilibrium. If one considers p and r the frequency of favorable allele for populations 1 and 2, respectively, the allele frequency after crossing the two populations 1 and 2, respectively, the allele frequency after crossing the two populations will equal to t = (1/2) (p + r). A measure ^ of departure from Hardy-Weinberg equilibrium is considered as given by Crow & Kimura (1970). This factor affects the distribution of the genetic variance among and within progenies. Estimates of the genetic gain by means of variance components from experimental data are inderestimated because of some inherent properties of the breeding method. Firstly, the genetic variance among progenies decreases after polycrossing. Secondly, the gain is also a function of an unestimable component of genetic variance which includes the ^ parameter. If only one population is improved through this process estimates of genetic gain become more realistic since ^ is zero, in this case. Also, estimates of heterosis and genotype x environments interactions may (...) |
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Palavras-Chave: |
Plantas; Plants. |
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Thesagro: |
Genética. |
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Thesaurus Nal: |
genetics. |
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Categoria do assunto: |
F Plantas e Produtos de Origem Vegetal |
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Marc: |
LEADER 02064nam a2200169 a 4500
001 1476475
005 2018-07-19
008 1982 bl uuuu u00u1 u #d
100 1 $aVELLO, N. A.
245 $aGanho genético esperado com seleção dentro de progênies e recombinação por policruzamentos.$h[electronic resource]
260 $aIn: CONFERÊNCIA INTERNACIONAL DE BIOMETRIA, 10., 1979, Guarujá. Anais. Brasília: EMBRAPA-DID, 1982. p. 522-531.$c1982
520 $aExpected genetic gain in breeding programs that imply within-progenie selection followed by recombination through polycrossing. Expression are developed in this study for predicting genetic gain in breeding programs that are based on within progeny selection followed by recombination through polycrossing. Expressions for variances and covariances are obtained by considering two populations with different gene frequencies, both in hardy-Weinberg equilibrium. If one considers p and r the frequency of favorable allele for populations 1 and 2, respectively, the allele frequency after crossing the two populations 1 and 2, respectively, the allele frequency after crossing the two populations will equal to t = (1/2) (p + r). A measure ^ of departure from Hardy-Weinberg equilibrium is considered as given by Crow & Kimura (1970). This factor affects the distribution of the genetic variance among and within progenies. Estimates of the genetic gain by means of variance components from experimental data are inderestimated because of some inherent properties of the breeding method. Firstly, the genetic variance among progenies decreases after polycrossing. Secondly, the gain is also a function of an unestimable component of genetic variance which includes the ^ parameter. If only one population is improved through this process estimates of genetic gain become more realistic since ^ is zero, in this case. Also, estimates of heterosis and genotype x environments interactions may (...)
650 $agenetics
650 $aGenética
653 $aPlantas
653 $aPlants
700 1 $aVENCOVSKY, R.
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