Codominance in F1 Generation

Steps:

• Cross two homozygous parents with codominant alleles (e.g., RR x WW).
• F1 offspring inherit one allele from each parent, resulting in all RW heterozygotes.
• Codominance means both alleles express fully in heterozygotes.
• Identify the F1 member showing both traits, confirming heterozygosity.

Why B is correct:

• B displays both codominant phenotypes, matching the heterozygous genotype per codominance definition.

Why the others are wrong:

• A shows only one phenotype, indicating homozygosity.
• C lacks codominant expression, suggesting recessive homozygote.
• D exhibits a single dominant trait, not codominance.

Final answer: B