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autosexinga technique by which the sex of an offspring can be determined without examination of the genitalia. For example, the sex of young poultry chicks is difficult to determine anatomically. However, a ‘Barring’ gene allows the feather colour of females (one X-chromosome) to be distinguished from that of males (two Xs).
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005