Several homologous relations: direct homologous, homologous homology and heterogeneous homologous

Biological information must be made clear of these kinds of homologous relations!

Reference: Direct homology and side-line homology

Direct homology (orthologous) refers to the homology of different species , such as the homology of proteins, the homology of DNA sequences. Orthologs refers to proteins from different species that evolve from a vertical family (speciation), and a typical reservation has the same function as the original protein.

The homologous homology (paralogs), a protein derived from gene replication in certain species , may evolve new functions related to the original.

The analysis of the homologous family of proteins is important for establishing the relationship between species and predicting the function of the new protein sequence, the homologous protein (homolog) is further divided into direct homologous (ortholog) and homologous (Paralog), the former refers to Genes with the same function and common origin in different species , while the latter refers to genes that have different functions within the same species, but also have a common origin, such as alpha-globin, beta-globin, and myoglobin , which originate from the Pearl protein.

similarities and differences sources (Xenolog): Refers to the horizontal transfer of similar genes (similar sequences that has arisen out of horizontal gene transfer), among organisms, the use of other means of transmission of the gene, If the gene is injected into the virus, it should be differentiated from the direct homologous and homologous

Several homologous relations: direct homologous, homologous homology and heterogeneous homologous