What type of genes are expressed only in the absence of a dominant gene?

• A. Recessive Genes
• B. Dominant Genes
• C. Codominant Genes
• D. X-linked Genes

Answer: (A)

Recessive genes are expressed only when a dominant gene is not present. This means that for a recessive trait to be observable in an individual, that individual must inherit two copies of the recessive gene, one from each parent. If at least one dominant gene is present, its trait will overshadow the expression of the recessive one. This fundamental genetic principle is crucial for understanding inheritance patterns and how certain traits are passed down through generations. In this context, recessive genes play a key role in traits that may not be apparent in a phenotype unless specific genetic conditions are met.