The answer is that they have to make special crosses between two existing varieties or wild accessions and place the resulting seedlings into a special planting called a "mapping population
." Mapping populations
(there are 12 in the VitisGen2 project) typically consist of 200-300 full-sibling progeny of these crosses, grown in the field.
Consequently, 66 primer combinations were chosen to genotype the mapping population
In general it has been observed that 30-50% of the chickpea SSR markers are polymorphic in any given breeding or intra-specific mapping population
, so SSR markers are reported as preferential marker for marker assisted selection in many breeding programs.
Singh, "Downy mildew resistance QTLs from a seedling heat tolerance mapping population
," International Sorghum and MilletNewsletter, vol.
In SG, a subset of the mapping population
constituting 10-15% of the lines from the phenotypic extremes is selected for genotyping (Figure 7(c)).
density allows one to compare the spatial distribution of population over time, and sheds some light on population movement within a region.
"This book intends to provide geneticists with the tools needed to understand and model the genetic variation for drug response based on genomic data collected in a mapping population
and to equip statisticians with the motivation and ideas used to explore genomic data."
A cross was made between the elite inbreds R15 (resistant) and 478 (susceptible), which had been identified in earlier studies, to form the mapping population
. The resistant parent R15 was bred at the Maize Research Institute of Sichuan Agriculture University and identified through many years of evaluations to have a high level of resistance to BLSB, possess good general combining ability (GCA), and have good agronomic characteristics.
The F2 generation seeds (the mapping population
) will be collected and sown.
The mapping population
used was a hybrid population developed from two cultivars, Phalaenopsis '20' and '462'.
A total of 12 DNA markers were surveyed on the mapping population
. Gel pictures showing some of the dominant and co-dominant segregating markers are given in Fig 2-4.