An X-linked copy of P{5'rib7.211} has no significant effect on the percentage of sex chromosome nondisjunction in T(1;4)mscd1 or T(1;4)mscd2 males.
Improves recovery of reciprocal products from Df(1)X-1/Dp(1;Y)BSYy+ males as well as male fertility. Increases fertility of Df(1)X-1; T(Y;2)B80 from 0 to 57.9%.