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Q. When a cluster of genes show linkage behaviour they

AIPMTAIPMT 2003Molecular Basis of Inheritance

Solution:

When a cluster of genes show linkage behaviour they do not show independent assortment. Law of independent assortment suggests that when two or more than two factors are considered together, these factors would show independent and random assortment during distribution in gametes. It is, therefore, necessary that if two characters have to assort independently, they should be located on non- homologous chromosome. But due to linkage when two or more genes are located in the same chromosome, independent assortment is not possible. Because, the prime necessity of independent assortment is the presence of the characters in different chromosomes (non-homologous).