Amino acid replacement R652C (the same lesion as found in haync2).
Males carrying one copy of haync2.tMa in either a wild-type or Df(3L)Ez7/+ background are fertile.
βTub85Dn, haync2.tMa has male semi-sterile phenotype
βTub85Dn, +/Df(3L)Ez7, haync2.tMa has male sterile | dominant phenotype
βTub85Dn/betaTub85D[+], haync2.tMa has male semi-sterile phenotype
βTub85Dn/betaTub85D[+], Df(3L)Ez7, haync2.tMa has male sterile phenotype
Approximately 25% of βTub85Dn haync2.tMa transheterozygotes are male sterile. βTub85Dn, haync2.tMa transheterozygotes with a copy of hay removed by Df(3L)Ez7 are completely sterile.