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  2. Mutation - Wikipedia

    en.wikipedia.org/wiki/Mutation

    Neomorphic mutations are a part of the gain-of-function mutations and are characterized by the control of new protein product synthesis. The newly synthesized gene normally contains a novel gene expression or molecular function. The result of the neomorphic mutation is the gene where the mutation occurs has a complete change in function. [55]

  3. Genetic variation - Wikipedia

    en.wikipedia.org/wiki/Genetic_variation

    Genetic variation is the difference in DNA among individuals [1] or the differences between populations among the same species. [2] The multiple sources of genetic variation include mutation and genetic recombination. [3] Mutations are the ultimate sources of genetic variation, but other mechanisms, such as genetic drift, contribute to it, as well.

  4. Human genetic variation - Wikipedia

    en.wikipedia.org/wiki/Human_genetic_variation

    Human genetic variation is the genetic differences in and among populations. There may be multiple variants of any given gene in the human population (alleles), a situation called polymorphism. No two humans are genetically identical. Even monozygotic twins (who develop from one zygote) have infrequent genetic differences due to mutations ...

  5. BRCA mutation - Wikipedia

    en.wikipedia.org/wiki/BRCA_mutation

    Medical genetics. A BRCA mutation is a mutation in either of the BRCA1 and BRCA2 genes, which are tumour suppressor genes. Hundreds of different types of mutations in these genes have been identified, some of which have been determined to be harmful, while others have no proven impact.

  6. Genetic disorder - Wikipedia

    en.wikipedia.org/wiki/Genetic_disorder

    A genetic disorder is a health problem caused by one or more abnormalities in the genome. It can be caused by a mutation in a single gene (monogenic) or multiple genes (polygenic) or by a chromosome abnormality. Although polygenic disorders are the most common, the term is mostly used when discussing disorders with a single genetic cause ...

  7. Genetic causes of type 2 diabetes - Wikipedia

    en.wikipedia.org/wiki/Genetic_causes_of_type_2...

    Polygenic. Genetic cause and mechanism of type 2 diabetes is largely unknown. However, single nucleotide polymorphism (SNP) is one of many mechanisms that leads to increased risk for type 2 diabetes. To locate genes and loci that are responsible for the risk of type 2 diabetes, genome wide association studies (GWAS) was utilized to compare the ...

  8. Gene duplication - Wikipedia

    en.wikipedia.org/wiki/Gene_duplication

    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. If one copy of a gene experiences a mutation that ...

  9. Germline mutation - Wikipedia

    en.wikipedia.org/wiki/Germline_mutation

    Huntington's disease is an autosomal dominant mutation in the HTT gene. The disorder causes degradation in the brain, resulting in uncontrollable movements and behavior. [17] The mutation involves an expansion of repeats in the Huntington protein, causing it to increase in size. Patients who have more than 40 repeats will most likely be affected.