CEREAL CHROMOSOME STRUCTURE , EVOLUTION , AND PAIRING Graham

Diversity of chromosome numbers and meiotic studies in genus Anchusa (Boraginaceae) from Iran (10 Nov 2015)

The present study reports the chromosome number and meiotic behaviour of 14 populationsbelonging to four taxa of Anchusa subgenus Buglossum Gusul. from Iran. All populationsshowed the chromosome number 2n= 4x= 32. It is the first meiotic study for A. subg.Buglossum. We discuss some habit form and evolutionary aspect in the light of cytogeneticdata. The origin of polyploidy (auto-allopolyploidy)...

Control of Chromosome Pairing and Genome Evolution in Disomic Polyploids Updated: 2/17/06 Readings: Naranjo,T. and E. Corredor. 2005. Clustering of centromeres precedes bivalent chromosome pairing of polyploid wheats. Trends in Plant

Molecular Biology Select

The duplication of genes, of noncoding DNA, and occasionally of entire genomes has contributed to biological and genetic diversity. Recent studies examine both the benefits and challenges associated with duplication events and highlight some of the existing unsolved mysteries of molecular evolution. Although the ancestral form of wheat is diploid, some commercial varieties are tetra-or even hex...

Homoeologous chromosome pairing across the eukaryote phylogeny.

During the past quarter century, molecular phylogenetic inferences have significantly resolved evolutionary relationships spanning the eukaryotic tree of life. With improved phylogenies in hand, the focus of systematics will continue to expand from estimating species relationships toward examining the evolution of specific, fundamental traits across the eukaryotic tree. Undoubtedly, this will e...

The program of sex chromosome pairing in meiosis is highly conserved across marsupial species: implications for sex chromosome evolution.

Marsupials present a series of genetic and chromosomal features that are highly conserved in very distant species. One of these features is the absence of a homologous region between X and Y chromosomes. According to this genetic differentiation, sex chromosomes do not synapse during the first meiotic prophase in males, and a special structure, the dense plate, maintains sex chromosome associat...