What is an Ohnolog?
In vertebrates, whole genome duplications (WGD) were first hypothesized by Susumu Ohno [2] (the 2R-hypothesis), after whom WGD duplicated genes are now referred to as “ohnologs”.
How has gene duplication played a role in evolution?
The most obvious contribution of gene duplication to evolution is providing new genetic material for mutation, drift, and selection to act upon, making new evolutionary opportunities possible (Zhang 2003).
What is paralogous genes?
Paralogous genes (or paralogs) are a particular class of homologous genes. They are the result of gene duplication and the gene copies resulting from the duplication are called paralogous of each other.
What is meant by genome duplication?
Definition. 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.
What are the possible fates of a duplicated gene?
Evolutionary fates of duplicated genes The most likely fate is that one of the pair will degenerate to a pseudogene or be lost from the genome due to the vagaries of chromosomal remodelling, locus deletion or point mutation (in a process known as NON-FUNCTIONALIZATION).
What are examples of paralogous genes?
Paralogs are genes related by gene duplication. Examples would be the beta-hemoglobin of human and the delta hemoglobin of chimpanzee, or the beta and delta hemoglobin of the same organism.
What happens to duplicated genes?
Gene duplications are an essential source of genetic novelty that can lead to evolutionary innovation. Duplication creates genetic redundancy, where the second copy of the gene is often free from selective pressure—that is, mutations of it have no deleterious effects to its host organism.
What is a chromosome duplication?
Duplication Duplication is a type of mutation that involves the production of one or more copies of a gene or region of a chromosome. Gene and chromosome duplications occur in all organisms, though they are especially prominent among plants.