Analysis of specific genetic contributions to quantitative traits has been done by

A)altering the environment of individuals and observing phenotype alterations.
B)completing sequencing of specific genes for various species.
C)measuring V_G by adding V_A,V_D,and V_I.
D)conducting ANOVA on genetic markers and phenotypes to identify linkage to QTLs.
E)measuring specific environmental effects,such as sunlight,on phenotype.