In maize, a Ds or Ac transposon can cause mutations in genes at or near the site

Question

In maize, a Ds or Ac transposon can cause mutations in genes at or near the site of transposon insertion. It is possible for these elements to transpose away from their original site, causing a reversion of the mutant phenotype. In some cases, however, even more severe phenotypes appear when these

What might be happening to the transposon or the nearby gene to create more severe mutations?

Check all that apply.

overexpression of the nearby gene

insertions in the nearby gene

chromosome breakage

deletions in the nearby gene

overexpression of the nearby gene

insertions in the nearby gene

chromosome breakage

deletions in the nearby gene

Explanation / Answer

In maize, it has been found that more complex structures can be generated when one Ds element inserts into or near another Ds element. These complex elements so generated are capable of inducing chromosome breakage. Besides this, Ac and Ds are also capable of inducing large-scale structural rearrangements of the genome such as chromosome translocations, inversions, and deletions. Therefore, according to above discussion you should choose option (c ) i.e. chromosome breakage. Other options i.e. overexpression, insertion or deletion in the nearby gene do not apply to Ac/ Ds transposition. Answer (C )

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