Answer: Codominence
Explanation:
Codominence is a condition in which two alleles of the same gene are expressed equally. Both alleles are capable of exerting their effects on the organism. Thus instead of expression of one trait both traits are expressed.
Your answer would be $4 times $y.
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Based on the CDC Article There were about 300 species of birds infected by the west Nile virus in Florida. good luck:)