This theory was proposed by T.H Morgan, he has conducted many experiments in drosophila. He has got Nobel Prize in 1933
It consists of four points they are
Genes that show linkage are situated on same chromosome
Genes are Linearly arranged in Chromosomes
the strength of linkage is directly propotional to the distance between the genes
During the course of inheritance linked genes remain in their original combinations.
Two genes in a heterozygous individual shows “Cis” or “Trans” type of arrangement
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