Body color in grasshoppers is inherited by gene C, which has multiple alleles. F

Question

Body color in grasshoppers is inherited by gene C, which has multiple alleles. Four of these alleles are listed below (alphabetical):
soft
polka
speckled
striped
Pair-wise crosses gave the following results:
Pairwise cross F1 phenotypes F2 phenotypes
soft X soft All soft Soft
striped X soft All striped Striped : soft :: 3:1
striped X polka All striped Striped : polka :: 3:1
striped X speckled All striped Striped : speckled :: 3:1
speckled X polka All speckled polka Speckled : polka : speckled polka :: 1:1:2
speckled X soft All speckled Speckled : soft :: 3:1
polka X soft All polka Polka : soft :: 3:1
Determine the dominance relationships and explain all your results logically.

Explanation / Answer

No matter if striped is paired with soft, polka, or speckled, majority of the offspring is striped. That means, striped is most dominant. No matter if soft is paired with striped, polka, or speckled, minority of the offspring is soft. That means, soft is least dominant. When you look at speckledxpolka, there is offspring that is both speckled and polka. That means, both of them are of same dominance (which is why both of them show together). So when arranged in increasing order of dominance, soft

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