The sixth mutant codon of the beta globin gene causing polymerization of haemoglobin and change in $RBC$ shape is . . . . . . .

The chromosome shown in the diagram below is broken at the points which are indicated by the arrows and the genes between these points become inverted. The resulting order of the genes will be:

The locus of a mutation is .....

Most mutations are .......

Which phenomenon leads to the variation in $DNA$?

Discontinuous variations are: