Which two substances bind using a lock-key mechanism?

How does the study of genetic disorders such as pku biologists understand normal alleles?

We all have different forms of genes from our parent(s).what are these different forms called? a.alleles b.characters c.dna d.resources

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 elements excise from this site, due to events at or near the mutant allele. what might be happening to the transposon or the nearby gene to create more severe mutations?