Use this URL to cite or link to this record in EThOS: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.664095
Title: Identifying genes that underlie evolution of Antirrhinum species
Author: Yang, Chia Ching
Awarding Body: University of Edinburgh
Current Institution: University of Edinburgh
Date of Award: 2006
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Abstract:
To study the genetic basis for differences between plant species, Antirrhinum was used as a model. Antirrhinum provides huge morphological variation between different species but the species can be crossed to each other to make hybrid offspring. Antirrhinum majus, which has larger organs, smooth leaves and erect stems, was crossed with Antirrhinum molle, which has smaller organs, very hairy leaves and is more like a creeper, to produce an F2 hybrid population. This gives the chance to understand the difference between two different species. A genetic map of the F2 population, containing 192 markers in eight linkage groups, was built for quantitative trait loci (QTL) analysis. More than 70 different morphological traits were analysed to compare the variance within and between organs and individuals. Eighty significant QTLs were detected for 29 traits, averaging three loci per trait. Each locus explained 10.9% - 91.2% of the variance in the trait (average 47.4%). Loci together explained 20.5% - 96.4% of these total variance in each trait (average 50.7%). The loci were spread throughout the genome and most loci (61.6%) had co-dominant alleles (i.e. both are likely to be active to different degrees). Most alleles (72.6%) act in the parental direction, suggesting strong, recent selection for morphological diversity.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.664095  DOI: Not available
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