Pseudoalleles (Lewis, 1951) are duplicate factors and are

two closely linked genes situated at adjacent but different loci affecting the same trait and hardly separated by crossing over

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forms of same allele

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mutation in different genes producing alleles with same effect

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two alleles on same loci with same effect

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Solution

The correct option is A two closely linked genes situated at adjacent but different loci affecting the same trait and hardly separated by crossing over
one of two or more genes that are seemingly allelic, but which can be shown to have distinctive but closely linked loci.

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