Practice question

Since clonal propagation involves mitotic division copying entire genome without meiosis, heterozygous advantage, epistatic interactions, and allelic combinations that produce superior performance are perpetuated unchanged across commercial plantations. Once elite genotype is identified from seedling population or mutation screening, it can be multiplied rapidly via cuttings, grafts, or in vitro micropropagation to produce millions of identical plants within year, bypassing slow seed multiplication and avoiding segregation that would break favorable gene complexes. This captures non-additive genetic variance including dominance and overdominance contributing to heterosis, which would be lost in sexual reproduction. Resulting crop exhibits uniform maturity, fruit size, quality, and market appeal, facilitating mechanized operations and brand consistency demanded by processing industry. Preservation of genotype also allows maintenance of sterile triploids like banana that cannot reproduce sexually, securing commercial viability of seedless clones and high value horticultural varieties. Tissue culture micropropagation using meristem culture, somatic embryogenesis, and bioreactor systems enables year-round production of disease-free elite clones independent of season, facilitating rapid dissemination of new varieties and international germplasm exchange under phytosanitary regulations and quarantine protocols for horticultural crops globally.