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Quantitative trait loci mapping or QTL mapping is the process of identifying genomic regions that potentially contain genes responsible for important economic, health or environmental characters. Mapping QTLs is an important activity that plant breeders and geneticists routinely use to associate potential causal genes with phenotypes of interest. Family-based QTL mapping is a variant of QTL mapping where multiple-families are used. Pedigree in humans and wheat Pedigree information include information about ancestry. Keeping pedigree records is a centuries-old tradition. Pedigrees can also be verified using gene-marker data. Family-based QTL mapping in plants The method has been discussed in the context of plant breeding populations.〔 Pedigree records are kept by plants breeders and pedigree-based selection is popular in several plant species. Plant pedigrees are different from that of humans, particularly as plant are hermaphroditic - an individual can be male or female and mating can be performed in random combinations, with inbreeding loops. Also plant pedigrees may contain of "selfs", i.e. cloned offspring resulting from self-pollination of a plant. == Pedigree denotation == SIMPLE CROSS SYMBOL Example / first order cross SON 64/KLRE //, second order cross IR 64/KLRE // CIAN0 /3/, third order cross TOBS /3/ SON 64/KLRE // CIAN0 /4/, fourth order cross TOBS /3/ SON 64/KLRE // CIAN0 /4/ SEE /n/, nth order cross BACK CROSS SYMBOL *n n number of times the back cross parent used left side simple cross symbol, back cross parent is the female, right side – male, Example: SEE/3 *ANE, TOBS *6/CIAN0 The idea of family-based QTL mapping comes from inheritance of marker alleles and its association with trait of interest〔 has demonstrated how to use family-based association in plant breeding families. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Family-based QTL mapping」の詳細全文を読む スポンサード リンク
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