An Australian mouse species and a closely related American mouse species normally have high population growth. If these species were to be mixed into the same area, which of the following would LEAST likely occur?

Answer

The American and Australian species would cohabit the region with little change to either species.

Explanation

When two species are combined in one area, the species that adapts better to the environment will be more likely to survive while the other is driven into extinction. Therefore, either of the two species can drive the other into extinction in this case. Another most probably effect is each species moving to different niches as resources become more and more limited. The least likely effect would be little changes to the genome. We know that genetic diversity is caused by high population growth as gene changes are magnified after every generation hence the correct answer is option 2 "The American and Australian species would cohabit the region with little change to either species."