Question

What is the meaning of


Cistron

Muton

Recon.

Answer 1

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CISTRON

A cistron is an alternative term to a gene.The word cistron is used to emphasize that genes exhibit a specific behavior in a cis-trans test; distinct positions (or loci) within a genome are cistronic.
For example, suppose a mutation at a chromosome position x is responsible for a recessive trait in a diploid organism (where chromosomes come in pairs). We say that the mutation is recessive because the organism will exhibit the wild type phenotype (ordinary trait) unless both chromosomes of a pair have the mutation (homozygous mutation). Similarly, suppose a mutation at another position, y is responsible for the same recessive trait. The positions x and y are said to be within the same cistron when an organism that has the mutation at x on one chromosome and has the mutation at position y on the paired chromosome exhibits the recessive trait even though the organism is not homozygous for either mutation. When instead the wild type trait is expressed, the positions are said to belong to distinct cistrons / genes. It's important to know that cistron localization has been studied for several years, and, depending of the organism, this gene can be found in different places. For example, the gene can be found in RNA phage and is related to the cistron coat in some particular organisms. Some examples of the organisms that have been study are Tobacco, grapevine.

For example, an operon is a stretch of DNA that is transcribed to create a contiguous segment of RNA, but contains more than one cistron / gene. The operon is said to be polycistronic, whereas ordinary genes are said to be monocistronic.


MUTON

The smallest element of genetic material capable of undergoing a distinct mutation, usually identified as a single pair of nucleotides.

RECON

Recon:

They are locations within a gene which participate in recombination. There is a minimum distance between recons within a gene, and recombination cannot occur within a recon. The term “recon” is a unit of recombination.

Muton:

They are elements within a gene that can undergo a mutation and lead to the production of mutant phenotype. The term “muton” is a unit of mutation. Each recon may have several mutons within them, and many mutons within a recon may stay linked because of recombination.

Thus, a gene may have one more than one cistrons, a cistron may have several recons, and a recon may have several mutons.


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