CBSE · Class 10 · Science · HeredityWhat is heredity? Explain its significance in the continuity of life on Earth.

Heredity refers to the transmission of genetic characters or traits from parents to their offspring, either through sexual or asexual reproduction. This process is the primary reason why offspring resemble their parents, sharing physical, physiological, and biochemical characteristics. The significance of heredity in the continuity of life is profound. It ensures that the basic blueprint and structural organization of a species are faithfully preserved and passed down from one generation to the next. Without heredity, biological characteristics would be entirely random, making it impossible for species to maintain their distinct identity over time. Furthermore, while heredity maintains stability and species consistency, it also interacts with variation. Although offspring inherit parental traits, minor variations can occur due to DNA copying errors, mutations, or sexual recombination. These variations, passed down through heredity, provide the raw material for evolution by natural selection, enabling populations to adapt to changing environmental conditions over long periods.