AP BIOLOGY

Detailed explanation-1: -Recombination frequency is the percent of meioses in which homologous recombination exchanges two loci. In genetic mapping, this number expresses distance in map units (m.u.) or centiMorgans (cM) (named after geneticist Thomas Hunt Morgan).

Detailed explanation-2: -Recombination frequency () is the frequency with which a single chromosomal crossover will take place between two genes during meiosis. A centimorgan (cM) is a unit that describes a recombination frequency of 1%.

Detailed explanation-3: -Geneticists routinely convert recombination frequencies into cM: the recombination frequency in percent is approximately the same as the map distance in cM. For example, if two loci have a recombination frequency of 25% they are said to be  25cM apart on a chromosome (Figure 7.6.

Detailed explanation-4: -Map units can be determine by calculating the percent recombination (recombination frequency) between the two genes on the chromosome. One percent recombination is equal to one map unit, two percent recombination is equal to two map units, and so forth.