Some radioactive iodide salts of sodium, including [ 125I ]NaI and [ 131I ]NaI, have radiopharmaceutical uses, such as in the treatment of thyroid cancer and hyperthyroidism or as radiolabeling tracers in imaging (see).
Genetic drift is defined as the changing of the number of available alleles in a population by chance events. Also called allelic drift, this phenomenon is usually due to a very small gene pool or population size.
â¢ No biased migration: genotypes do not enter or exit the population non-randomly â¢ No biased random events: genotypes do not get zapped by lightning (or whatever) non-randomly; if so, called genetic drift â¢ Mating is random by genotype. Violating this assumption affects genotype frequency, not allele frequency. This is NOT the same thing as sexual selection (unequal gametic contribution of genotypes).