Although the law of independent assortment is generally applicable, when two loci are on the same chromosome the phenotypes of the progeny sometimes do not fit the phenotypes predicted. this is due

Linkage

Explanation:

The existence of two loci on the same chromosome (linkage) increases the chances of the genes on these loci to assort or be inherited together.

The closer the two loci on the chromosome, the higher the chances of the two genes being inherited together and further apart they are, the lower the chances because the two genes are more likely to be separated during recombination.

Hence, if two loci on the same chromosome produce progeny that do not fit the predicted phenotypes according to the law of independent assortment, it means the two loci are linked.

The answer is linkage.

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