In mermaids, blue hair (B) is dominant to silver hair (b). What is the phenotype for a mermaid who is bb?

Silver Hair

Explanation:

In the question, we see that silver hair (b) is recessive. hence a mermaid who has Bb or BB will have blue hair BUT a mermaid who has bb will have silver hair as it takes 2 recessive alleles in an organism to bring out a recessive trait in them.

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the answer is

c. parental