For a quantitative trait explained by four loci in an additi

For a quantitative trait explained by four loci in an additive fashion, if the four locus genotype AaBbCcDd corresponds to a phenotypic value of 20, and the four locus genotype AABBCCdd corresponds to a phenotypic value of 30, then what is the phenotypic value corresponding to the four locus genotype AaBbccdd?

Solution

Answer: 10

Explanation:

Each dominant allele comprises 5 value, no value for recessive alleles.

AaBbCcDd = 5+5+5+5=20

AABBCCdd= 10+10+10 =30

AaBbccdd = 5+5=10