Question

how does codominance affect the phenotype expression in flowers? one allele will be expressed neither allele will be expressed both alleles will be expressed

Explanation:

Codominance is a genetic phenomenon where two alleles of a gene are both expressed in the phenotype. In flowers, this means that if a flower has two different alleles for a trait (like petal color), both alleles' characteristics will be visible. For example, if one allele codes for red petals and another for white petals, in codominance, the flower would have both red and white patches (not a blend as in incomplete dominance). So, it's not that one allele is masked (as in simple dominance where one allele is expressed over the other) or that neither is expressed.

Answer:

both alleles will be expressed