Would a trait that has only two distinct phenotypes more likely be a single gene trait or a polygenic trait? how do you know?

Single gene trait

Explanation:

Single gene trait because is only controlled by one gene with two alleles and polygenic traits can have many possible phenotypes

A single gene trait is expressed by possible combination of two alleles of a single gene. A polygenic trait is controlled by several genes and hence it can lead to expression of multiple phenotypes.  

For instance height is a single gene trait while eye color is a polygenic trait.

answer: 20 percent

the fish culture has become a developing commercial practice in developing countries which is already prominent in developed countries of the world. the major fish protein demand is being supplemented in developing countries is   fishing to meet the needs of the growing population. therefore, in some developing nations, the percentage of animal protein from fish in the diet can be as high as 20 percent.