<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>1405-3195</journal-id>
<journal-title><![CDATA[Agrociencia]]></journal-title>
<abbrev-journal-title><![CDATA[Agrociencia]]></abbrev-journal-title>
<issn>1405-3195</issn>
<publisher>
<publisher-name><![CDATA[Colegio de Postgraduados]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1405-31952007000100057</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Estimación de los parámetros biométricos de los QTL en poblaciones F 2: un nuevo enfoque]]></article-title>
<article-title xml:lang="en"><![CDATA[Estimating QTL biometrics parameters in F 2 populations: a new approach]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cerón-Rojas]]></surname>
<given-names><![CDATA[J. Jesús]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sahagún-Castellanos]]></surname>
<given-names><![CDATA[Jaime]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma Chapingo Fitotecnia ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>02</month>
<year>2007</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>02</month>
<year>2007</year>
</pub-date>
<volume>41</volume>
<numero>1</numero>
<fpage>57</fpage>
<lpage>73</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-31952007000100057&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-31952007000100057&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-31952007000100057&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Los procedimientos estándar para construir mapas de loci de caracteres cuantitativos (QTL o QuantitativeTrait Loci, por sus siglas en inglés) se basan en la estimación por máxima verosimilitud o mínimos cuadrados de los parámetros biométricos del QTL y generalmente requieren métodos numéricos y software especial, ya que no producen estimadores explícitos. El objetivo del presente trabajo fue derivar estimadores explícitos de los parámetros biométricos de un QTL en una población F2. La derivación se basó en tres combinaciones lineales de variables aleatorias con distribución normal mezclada y un marcador molecular. Para cada combinación lineal se determinaron su media y varianza y, con éstas, se derivaron estimadores del efecto aditivo y del efecto de dominancia del QTL, además de la frecuencia de recombinación entre éste y el marcador. Los estimadores explícitos aquí obtenidos fueron asintóticamente consistentes e insesgados y no requieren software especial para su evaluación.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The standard procedures for constructing maps of Quantitative Trait Loci (QTL) are based on the estimation by maximum likelihood or minimum squares of the QTL biometrics parameters and generally require numerical methods and special software, given that they do not produce explicit estimators. The objective of the present study was to derive explicit estimators of the biometrics parameters of a QTL in an F2 population. The derivation was based on three linear combinations of random variables with mixed normal distribution and a molecular marker. For each linear combination, its mean and variance were determined, with which estimators were derived of the additive effect and dominance effect of the QTL, as well as the frequency of recombination between the QTL and the marker. The explicit estimators obtained here were asyntotically consistent and unbiased, and do not require special software for their evaluation.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Caracteres cuantitativos]]></kwd>
<kwd lng="es"><![CDATA[distribuciones mezcladas]]></kwd>
<kwd lng="es"><![CDATA[frecuencia de recombinación]]></kwd>
<kwd lng="es"><![CDATA[marcadores moleculares]]></kwd>
<kwd lng="es"><![CDATA[perfil de verosimilitud]]></kwd>
<kwd lng="en"><![CDATA[Quantitative traits]]></kwd>
<kwd lng="en"><![CDATA[mixed distributions]]></kwd>
<kwd lng="en"><![CDATA[recombination frequency]]></kwd>
<kwd lng="en"><![CDATA[molecular markers]]></kwd>
<kwd lng="en"><![CDATA[likelihood profile]]></kwd>
</kwd-group>
</article-meta>
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