1. is it true that dominant phenotypes are always the most common in a population? explain your answer

This is not true, however it is statistically very unlikely for it to be untrue. It is possible for all people to carry the recessive phenotype and just get so lucky that all children get the double recessive pair. However, the more likely outcome is that most people have at least one dominant allele and so the dominant phenotype is typically most common, buy now always

The answer is observations and interpreting.

If you eat to much it could kill you.