Question

multiple choice question
in which inheritance pattern are both alleles expressed in the heterozygous condition?

codominance
incomplete dominance
multiple alleles
dominant/recessive

Explanation:

To solve this, we analyze each option:

• Codominance: Both alleles in a heterozygote are fully expressed (e.g., AB blood type where A and B alleles are both expressed).
• Incomplete dominance: Heterozygote shows a blend (e.g., pink flowers from red and white), not both alleles expressed.
• Multiple alleles: Involves more than two alleles for a gene, not about expression of two alleles in heterozygote.
• Dominant/recessive: Only dominant allele is expressed in heterozygote, recessive is masked.

So the correct pattern is codominance.

Answer:

A. codominance