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Is called agreement to consent , he consent wave correspondence that exists between two elements . The term, which comes from Latin concordantia, can be used in various contexts.

In the field of grammar , the concordance is the formal congruence which must be registered among the flexible information of those words that are linked at a syntactic level.

What does the grammatical concordance is to establish the grammatical relationship between the different constituents. For this it appeals to cross references that lead to each word to adopt a certain form according to the traits determined by another word: both, by these traits, agree.

He number and the gender They are two of the traits that allow the development of grammatical concordance, which can be verbal, nominal or otherwise. To express themselves correctly, there must be a concordance between the articles, adjectives and nouns that form a sentence, to name a case.

This means that, if we are going to use the noun "home", for example, we will also have to use a feminine and singular article ("the") and an adjective that is concordant (such as "big"): "The big house". Expressions as “The big house”, “The big house” or “The big house” They have no concordance.

In the music , the concordance is the proportion that keep the diverse voices that, in a composition, sound together.

Talk about genetic agreement , on the other hand, to refer to the existence of the same phenotypic trait in a couple of individuals, usually of monozygotic twins although it can also be any pair and individuals that are in the set being studied.

The term phenotype It is used in the field of genetics, but also in other areas of study of biology, to refer to the expression of the genotype (genetic information in the form of DNA from a given organism), taking into account a particular environment. Phenotypic traits can be seen both in the body and in the behavior of individuals; In addition, the characteristics studied are not always visible, something that can be exemplified by enzymes.

In other words, genetic agreement can be defined as the probability that the two members of a given couple have the same characteristic, or that one of them has a characteristic that has been observed in the other.

Studies focused on monozygotic twin brothers seek to find the rate of genetic agreement of phenotypic traits, usually of diseases, to find out what percentage of these appear in the environment and how much they reach due to the genetic load. As the DNA of Twins Monozygotic is identical, they are expected to suffer the same genetic diseases; Although this is true for monogenic, not so in the case of polygenic.

Some studies twins have aroused controversial reactions, such as those who sought genetic agreement regarding the intelligence or homosexuality of individuals.

When part of the study consists in modifying the position of the DNA directly, altering a simple nitrogen base, the concordance is understood as the percentage of identical bases. In theory, this should be 100% in two samples of the same person or of monozygotic twins, but usually around 99% because of certain mutations somatic (changes a nucleotide or DNA organization) and test artifacts.

That said, it is understood that genetic agreement can also serve as a method to rate the accuracy of various tests. Using this procedure, it is expected that between parents and children there is an agreement close to 50%, since each individual inherits half of the DNA of each parent.

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