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3 ημέρες πριν · Duplication, as related to genomics, refers to a type of mutation in which one or more copies of a DNA segment (which can be as small as a few bases or as large as a major chromosomal region) is produced. Duplications occur in all organisms.
Gene duplication (or chromosomal duplication or gene amplification) is a major mechanism through which new genetic material is generated during molecular evolution. It can be defined as any duplication of a region of DNA that contains a gene.
31 Οκτ 2023 · Gene Duplication. Gene duplication is the process by which a region of DNA coding for a gene is copied. Gene duplication can occur as the result of an error in recombination or through a retrotransposition event. Duplicate genes are often immune to the selective pressure under which genes normally exist.
Definition. The term gene duplication describes a situation where a single ancestral gene has been copied such that two (or more) copies of that gene now exist in a single genome.
DUPLICATION AND AMPLIFICATION BY MULTISTEP PROCESSES DURING GROWTH UNDER SELECTION. Most models for duplication formation, like those for point mutations, propose a single discontinuous event or a cascade of immediately sequential events with intermediate structures that cannot be inherited.
In chromosomal duplications, extra copies of a chromosomal region are formed, resulting in different copy numbers of genes within that area of the chromosome.
20 Δεκ 2023 · Duplicate genes are genes that have identical or nearly identical DNA sequences and are found in the same or different regions of a chromosome or in different chromosomes within a genome. These genes are formed as a result of DNA replication or mutation events that create new copies of a gene.
