Fruit color in a particular plant is controlled by a set of three QTLs (quantitative trait loci,or "polygenes")that work in an equal and additive manner.Each QTL has two alleles (i.e. ,A and a);each allele represented by a capital letter produces one dose of yellow pigment,while alleles represented with lower case letters do not produce any pigment at all.
-Assuming no effects by the environment,how many different shades of yellow fruit color are there?

Question

Quizplus · Accepted Answer

Since each dominant allele (A) contributes equally to the yellow pigment, and there are three QTLs with two alleles each, the possible combinations range from 0 to 6 doses of pigment (none of the alleles contribute, to all contributing). This results in 7 possible shades of yellow (0, 1, 2, 3, 4, 5, 6 doses).

Fruit Color in a Particular Plant Is Controlled by a Set