endoreduplication Repeated duplication of the entire complement of genes within a single nucleus. It occurs in many actively metabolizing plant tissues, where it is evidenced by enlargement of the cell nuclei. The resultant multiplication of genes increases the amounts of messenger RNAs available to the cell, and hence permits the synthesis of large quantities of proteins. Compare gene amplification.
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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… Tandem Array , tandem array Repetitive DNA, where the repeating units are contiguous. Some genes of high copy number occur in tandem arrays e.g. ribosomal DNA in eu… Multiple Alleles , Alleles are alternative forms of a gene, and they are responsible for differences in phenotypic expression of a given trait (e.g., brown eyes versus… Operon , Operon An operon is a genetic regulatory system found in prokaryotes and the bacterial viruses (bacteriophages ) that attack bacteria. It is a cluste… Selfish Dna , Evolutionary biologists increasingly accept that genes are selfish. But what does this mean? Clearly genes do not have personal motivations, and even… knockout , knockout A technique for inactivating a particular gene or genes within an organism or cell. Both single-celled and multicellular organisms can be ge…
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