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  4. Chromosome maps/ genetic maps were first prepared by

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Q. Chromosome maps/ genetic maps were first prepared by

Principles of Inheritance and Variation

Solution:

Linkage or genetic or chromosome map is a linear graphical representation of the sequence and relative distances of the various genes present in a chromosome. The first chromosome maps were prepared by Sturtevant in $1911$ for two chromosomes and in $1913$ for all the four chromosomes of Drosophila.