Skin Color in a Certain Species of Fish Is Inherited

question 9

Multiple Choice

Skin color in a certain species of fish is inherited via a single gene with four different alleles. One fish of this type has alleles 1 and 3 (S₁S₃) , and its mate has alleles 2 and 4 (S₂S₄) . If each allele confers a unit of color darkness such that S₁ has one unit, S₂ has two units, and so on, then what proportion of their offspring would be expected to have five units of color?

• A) 1/4
• B) 1/8
• C) 1/2
• D) 0

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