Wheat Phenotypes and Genotypes

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It is obvious that we are talking about 2 pair of alleles (4 alleles total), both responsible for the plant color. When all four alleles are "red" color, the plant is dark red. One, two, three or four of the "white" allele makes the plant from medium-dark red to completely white:
4 "red"= dark red color
3 "red" 1 "white"= medium- dark red color
2"red" 2 "white"= medium red colur
1 "red" 3 "white"= light- red color
4 "white" = white color

This is also confirmed if you make the crossings.

However, I can't quite understand the question "How many additive alleles are needed to produce each possible phenotype?" Of course, I know that the "red" and "white" alleles are additive. But I can't understand what it asks.

All of them were right except for white. The correct answer was 0 white.

yes, that's why you need to read the reply carefully instead of just copying the answer. The white wheat didn't have any red alleles, and that's why I skipped them instead of writing 0 "red".

Anyways, I guess the exercise was asking for the number of red alleles. In my opinion, the question wasn't very accurate.

Thank you, nice explanation