The amount of milk purchased at grocery stores in East African countries varies dramatically based on the local population's lactose tolerance phenotype. Based on what we've previously discussed in class, this trend is explained best by what component of phenotype variance?

Environmental variance

Explanation:

The portion or part of the phenotype variance which is due to  the differences in the environments in which the individuals in a population has been exposed.

These type variation is caused by factors Which are found in the environment.

examples of such factors are

1. diet

2. Temprature e.t.c

just like the example cited in the case in East Africa milk purchased is less due to their lactose tolerance this is an example of an environmental variance.

the missing space is phylum