What is the correct genotype for an organism that expresses a recessive trait?

• A. Incomplete dominance
• B. Homozygous recessive
• C. Homozygous dominant
• D. Heterozygous

Answer: (B)

Verified step by step guidance

1. Understand the concept of recessive traits: A recessive trait is expressed only when an organism has two copies of the recessive allele. This means the organism must be homozygous recessive.
2. Review the concept of genotype: Genotype refers to the genetic makeup of an organism, specifically the alleles it possesses. For a recessive trait to be expressed, the genotype must be homozygous recessive.
3. Consider the options provided: Homozygous recessive, Homozygous dominant, and Heterozygous. Only homozygous recessive will express the recessive trait.
4. Incomplete dominance is a separate concept where neither allele is completely dominant, resulting in a blend of traits. This does not apply to the expression of a recessive trait.
5. Conclude that the correct genotype for expressing a recessive trait is homozygous recessive, as it is the only genotype that allows the recessive trait to be visible.