Suppose members of a true-breeding strain of salamanders with yellow stripes are crossed with a true-breeding strain with red stripes. Red and yellow are two alleles of the same gene. The resulting offspring have both yellow stripes and red stripes. Which dominance pattern is most likely?

Co-dominance pattern

Explanation:

Co-dominance is a phenomenon in which the two alleles of a gene exert equal effects on each other. That is neither allele of a gene is has the ability to suppress the expression of the other.

On the other hand, the alternate version of a gene represented by alleles are both expressed phenotypically in individuals carrying a co-dominant gene.

Apart from the illustration shown in the question, a good example of co-dominance can be observed in the human ABO blood system in which both allele A and B are expressed in individuals with AB blood group.

it is either c or d and i know for sure it is not a or b