Heteromorphism
Mostrando 25-27 de 27 artigos, teses e dissertações.
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25. The self-incompatibility (S) haplotypes of Brassica contain highly divergent and rearranged sequences of ancient origin.
In Brassica, the recognition of self-related pollen by the stigma is controlled by the highly polymorphic S locus that encodes several linked and coadapted genes and can span several hundred kilobases. We used pulsed-field gel electrophoresis to analyze the structure of different S haplotypes. We show that the S2 and S13 haplotypes of Brassica oleracea conta
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26. Diverse origins of multiple ovarian teratomas in a single individual.
Centromere heteromorphisms and enzyme markers were examined in cells cultured from seven benign ovarian teratomas arising in a single patient. Three of the teratomas were homozygous for all eight enzyme and centromere markers found to be heterozygous in the host. The other four tumors were heterozygous at the centromeres of chromosomes 1, 16, 17, and 18, as
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27. High-Resolution Physical Mapping in Pennisetum squamulatum Reveals Extensive Chromosomal Heteromorphism of the Genomic Region Associated with Apomixis1
Gametophytic apomixis is asexual reproduction as a consequence of parthenogenetic development of a chromosomally unreduced egg. The trait leads to the production of embryos with a maternal genotype, i.e. progeny are clones of the maternal plant. The application of the trait in agriculture could be a tremendous tool for crop improvement through conventional a
American Society of Plant Biologists.