Question

A mutation is most likely to have selective advantage if it

• A. Affects dominant alleles
• B. Affects recessive alleles
• C. Affects whole chromosome
• D. Environment remains stable

Answer 1

The correct option is B Affects recessive alleles

• Mutation is a change taking place at the DNA level that makes up a gene. Alleles are different variants of a gene.
  
• Dominant alleles already have an advantage over recessive alleles as they can express themselves in presence of recessive alleles.
  
• A mutation will have a selective advantage if it takes place in such a way that it affects recessive allele resulting in making recessive allele capable of expressing in presence of dominant allele.
• So, the correct option is 'Affects recessive alleles'.