How are genetic traits primarily inherited from parents?

• A. Through chromosomes
• B. Through genes
• C. Through alleles
• D. Through ribosomes

Answer: (C)

Genetic traits are primarily inherited through alleles, which are different versions of a gene. Alleles occupy the same position on homologous chromosomes and can result in variations in a trait. Each parent contributes one allele for a given gene to their offspring, which determines the offspring's genotype and, consequently, influences their phenotype. This inheritance occurs during the formation of gametes (sperm and egg) through the processes of meiosis and the random assortment of chromosomes, with each parent contributing genetic material that combines to form a new genetic blueprint.

While chromosomes and genes are also fundamental to genetic inheritance, alleles represent the specific variations of genes that directly lead to observable traits. Ribosomes, on the other hand, are involved in protein synthesis and do not play a role in the inheritance of genetic traits. Understanding the role of alleles clarifies how traits can vary among individuals, even among siblings who share the same parents.