Auto-sexing in silkworm is achieved through

Auto-sexing in silkworms is achieved through Translocation.
Translocation means a location change. It often refers to genetics, when part of a chromosome is transferred to another chromosome. Chromosomes are structures that carry genes, our units of heredity.
In silkworms, the female is the heterogametic sex and has one Z and one W chromosome, whereas the male has two Z chromosomes.