biochemical evolution (molecular evolution) The changes that occur at the molecular level in organisms over a period of time. These range from deletions, additions, or substitutions of single nucleotides, through the rearrangement of parts of genes, to the duplication of entire genes or even whole genomes. Such mutations may result in functional changes to the proteins encoded by the genes, or even the evolution of novel genes and proteins.
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repressor , repressor In the operon theory of gene regulation, a protein produced by a regulatory gene that inhibits the activity of an operator gene, and hence… Regulator Gene , regulatory gene In the operon theory of gene regulation, a gene that is involved in switching on or off the transcription of structural genes. When t… , neuron • , exon •Agamemnon, Memnon •ninon, xenon •noumenon • Trianon • xoanon •organon • Simenon • Maintenon •crampon, kampong, tampon •Nippon • coupon •Akron,… gene family , gene family A group of similar or identical genes, usually along the same chromosome, that originate by gene duplication of a single original gene. S… Recessive Gene , recessive gene A gene whose phenotypic effect is expressed in the homozygous state but masked in the presence of the dominant allele (i.e. when the o… Complementary Genes , complementary genes Mutant alleles at different loci which complement one another to give a wild-type phenotype. Dominant complementarity occurs wher…
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