The estimated 2020 US population is approximately 331 million people. Its current birth rate is approximately 11.6 per 1000 individuals per year. Its current death rate is approximately 8.7 per 1000 individuals per year. Assuming the US is still in an exponential growth phase, how many individuals are expected to be added to the US population in a year?

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?