1. a condition in which chromosomes replicate multiple times without separating, resulting in giant chromosomes with many parallel strands; commonly observed in certain insect cells.
Usage: biology; genetics; technical

Examples

• Polyteny in Drosophila salivary gland cells produces the distinctive banded giant chromosomes used in classical genetic mapping.
• The study of polyteny has been instrumental in understanding gene structure and chromosome organization.
• Giant polytene chromosomes are visible under a light microscope, making them valuable for cytogenetic research.
• Polyteny allows cells to increase gene expression by replicating DNA without cell division.