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Modifications (genetics)
In opposition to mutations, modifications are included in the band width of the genome of an individual creature. Mutation takes place when the DNA structures is partnered by the wrong structure (Proper rule: A=T and G=C for DNA and for mutation: A=G or A=C or T=G or T=C and G=A or G=T or C=A or C=T). Modifications are dependent on the plentiful of the substrate, light, warmth, stress, training, and so on.
A modification is a change in the physical appearance of an organism (phenotype) caused by environmental factors. Modifications can either be uninheritable or inheritable. In both cases, there is no change to the primary DNA sequence (genotype), rather an influence on gene expression which is the cause of the altered phenotype.
==Occurrence==
Modifications often occur in domesticated animals: Decrease of the brain weight by 20 to 30 percent, decline of the cerebral cleavage especially in the projection areas of the sense organs, changes in the hormone status and in the behavior.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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