The gene which increases the frequency of mutation in other gene is referred to as

The unmodified allele which represents the original phenotype is the $.........$ allele and the modified allele is generally the $.........$ allele.

$H.J. Muller$ was awarded the Nobel Prize for:

Chemical mutagens are considered more dangerous than radiations because:

Which of the following may produce mutants?

The reason for fault in gene duplication is