The difference between a genetic screening experiment and a selection experiment is that a screening experiment involves whereas a selection experiment creates conditions that irrelevant organisms.

substitution is the answer in this case

in the year 2850, humans successfully colonized mars. the martian modules that were constructed could hold only a small population of people. it is now a century later, and the population on mars has grown to 600 people. of the current mars population, 45 people express the recessive phenotype for phenylketon- uria (pku) syndrome (pp genotype).

explanation:

multiply it by 5 in order for you to understand i cant give an exact answer.