Genetic maps of chromosomes are a diagram of a linear sequence of genes in one linkage group and relative distances between them. Mapping is based on the constancy of percent crossing-over between specific genes. Genetic maps are compiled for each pair of homologous chromosomes. They are used in selection when predicting the possibility of obtaining organisms with a certain combination of characters. They are the basis for genetic engineering, as well as use in medicine for the diagnosis of severe hereditary human diseases.
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