A scientist observes that a certain trait is determined by a single gene. An organism inherited one version of the trait from one parent and
another version from the other parent. Both versions of the trait are
expressed in the phenotype of the offspring. Which pattern of
inheritance best classifies the observed trait?

Codominance

Explanation:

Codominance occurs when both alleles participation in the expression of the genotype of an offspring, such as a flower with patches of different colours, each coming from a different allele.

the answer to your question is slate

i think it’s c but i might be wrong. if i am let me know! have a good rest of your day as well!