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- Title
Excess Heterozygosity Contributes to Genetic Map Expansion in Pea Recombinant Inbred Populations.
- Authors
Knox, M.R; Ellis, T.H.N.
- Abstract
Several plant genetic maps presented in the literature are longer than expected from cytogenetic data. Here we compare F[SUB2] and RI maps derived from a cross between the same two parental lines and show that excess heterozygosity contributes to map inflation. These maps have been constructed using a common set of dominant markers. Although not generally regarded as informative for F[SUB2] mapping, these allowed rapid map construction, and the resulting data analysis has provided information not otherwise obvious when examining a population from only one generation. Segregation distortion, a common feature of most populations and marker systems, found in the F[SUB2] but not the RI, has identified excess heterozygosity. A few markers with a deficiency of heterozygotes were found to map to linkage group V (chromosome 3), which is known to form rod bivalents in this cross. Although the final map length was longer for the F[SUB2] population, the mapped order of markers was generally the same in the F[SUB2] and RI maps. The data presented in this analysis reconcile much of the inconsistency between map length estimates from chiasma counts and genetic data.
- Subjects
PEA genetics; PLANT gene mapping; GENETIC recombination
- Publication
Genetics, 2002, Vol 162, Issue 2, p861
- ISSN
0016-6731
- Publication type
Article
- DOI
10.1093/genetics/162.2.861