Extension of y sequences by gene conversion (using the y1 gene located on the homologous chromosome).
abnormal body color
adult cuticle
Body colour: flies have an extreme y1-type phenotype; all parts of the cuticle lack pigmentation.
Arose as: a female with a y2-type phenotype in the progeny of yYTD1 or yYTD2 derived females that had acquired a y1-type phenotype.