What one advantage of doing a field experiment instead of a laboratory experiment?

a. there are no variables when you do a field experiment.
b. it is easier to control variables in a field experiment.
c. field experiments do not require any measurements.
d. field experiments are better at representing what happens in the real world.

Answer

D. Field experiments are better at representing what happens in the real world.

In the laboratory, the valuables are so much controlled and we work with samples. There are a lot of assumptions that can not be ignored in the real world.

For this reasons, field experiments are better since they represent what happens in the real world.  

multiple allele inheritance is traits controlled by more than 2 alleles (ex: pigeons having 3 alleles of one gene govern their feather color).