Chromosome Map, Genes are Represent by Points, Proportional to Amount, Cross Over Maps, Directly Propotional

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Chromosome Map Procedure for Chromosome Mapping Construction of Chromosome Map in Drosophila Three Point Cross

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The chromosome map may be defined as a line, on which the genes are represented by points, separated by distances proportional to the amount of crossing over.

The chromosome maps are also referred to as cross over maps since they are sketched by the amount of crossing over.

The percentage of crossing over is directly proportional to the distance of the alleles showing crossing over in the chromosome.

The chromosome maps are the graphic representation of the genes in a chromosome.

The percentage of crossing over is calculated by test crosses. In mapping the genes, a unit of distance is used and it is called as map unit or Morgan unit.

The first chromosome map was made in 1911 by Sturtevant and soon after additional maps were made by Bridges and others.

Drosophila is the earliest material used by the scientists, for constructing maps.

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F₂Offspring Chromosome Maps of Drosophila Chromosome Maps of Maize Factors Affecting the Mapping