Chromosomes : étonnants polymères !

Shuffling Chromosomes

The gene order of chromosomes can be rearranged by chromosomal inversions that reverse the order of segments. Motivated by a comparative study of two Drosophila species, we investigate the number of reversals that are needed to scramble the gene order when all reversals are equally likely and when the segments reversed are never more than L genes. In studying this question we prove some new res...

Isolated Chromosomes

The chromatin threads, which we described briefly several years ago (1), have since then been studied carefully both morphologically and chemically. We now consider these microscopic threads of chromatin to be isolated chromosomes (2). From certain animal cells such masses of isolated chromosomes can be prepared that, with respect to quantity of material available, no special methods are requir...

Eukaryotic Chromosomes

The eukaryotic genome is made up of DNA/protein complexes called chromosomes. Despite the compaction of the DNA (deoxyribonucleic acid) with proteins, gene sequences embedded within chromosomes must still be available for transcription by RNA (ribonucleic acid) polymerases and all of the DNA must be capable of being copied by DNA polymerases. Chromosomes have two main functions: to ensure that ...

Somatic Chromosomes of Long-Eared Desert Hedgehog Hemiechinus auritus

Separation of lentil root tip chromosomes by colchicine