For a quantitative trait explained by three loci in a additi

For a quantitative trait explained by three loci in a additive fashion, if the three locus genotype aabbcc corresponds to a phenotypic value of 30, and the three-locus genotype AABBCC corresponds to a phenotypic value of 60, then what is the phenotypic value corresponding to the three-locus genotype AABbcc?

Solution

Depending on the cumulative action quantitative values are measured, these traits can vary among species, among individuals for example - blood pressure, height. Here we have two phenotypic traits value namely aabbcc - value is 30, another is AABBCC- value is 60.

As per the recessive trait go it has a phenotypic value of 30, so this is the base value. In case of additive fashion we have here Recessive trait come up to 6 allele with the value of 30, so each will be adding 5 to the value. In the same way when we look into the Dominant alleles they have a value of 60, so each will be adding 10 to the value.

Finally we can say the final genotype is AABbcc, so it has to be phenotypically expressed as (30+15) / (5 cm per additive allele {dominant alleles} x 4 additives, added to the base height of 30 cm) = come up to the value 45.