Core Balancer Definitions
Updated November 28, 2016
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Each balancer chromosome carried a particular set of dominant and recessive mutations when it was initially isolated. We call the original combination of inversions and marker mutations the “core balancer”. Subsequently, variant versions were often isolated with new marker mutations or transgenes. The list below provides the full genetic constitution of each core balancer used in Bloomington genotypes.

In genotypes, we list the core balancer symbol plus any variant markers with one exception -we list Tb[1] in TM6B genotypes even though it was present on the original TM6B chromosome because Tb[1] reverts at a high frequency. Many TM6B chromosomes now carry a Tb[+] allele.

FlyBase provides a single symbol for each balancer variant. For example, CyO-vAb represents the CyO core balancer plus the additional bw[1] marker. These single symbols are not used in Bloomington genotypes; instead, we list the variant markers explicitly.

The list below provides the full genetic constitution of each balancer symbol used in the Bloomington stock list. The balancer symbol links to a list with the rearrangement breakpoints of each balancer.

Go back to the Main balancer page.
Symbol Constitution
Basc In(1)sc[S1L]sc[8R]+S, sc[8] sc[S1] w[a] B[1]
Bascy In(1)sc[S1L]sc[8R]+S, y[82] sc[8] sc[S1] w[a] B[1]
Binsc In(1)sc[S1L]sc[8R]+dl-49, sc[8] sc[S1] B[1]
Binscy In(1)sc[S1L]sc[8R]+dl-49, y[c4] sc[8] sc[S1] B[1]
Binsinscy In(1)sc[S1L]sc[8R]+dl-49, y[c4] sc[8] sc[S1] w[1] sn[X2] B[1]
Binsn In(1)sc[S1L]sc[8R]+dl-49, sc[8] sc[S1] sn[X2] B[1]
ClB In(1)Cl, sc[1] l(1)C[1] t[2] v[1] sl[1] B[1]
FM0 In(1)sc[8]+dl-49, y[31d] sc[8] w[1] v[Of] m[2] f[1] B[1]
FM3 In(1)FM3, y[31d] sc[8] dm[1] B[1]
FM4 In(1)FM4, y[31d] sc[8] dm[1] B[1]
FM6 In(1)FM6, y[31d] sc[8] dm[1] B[1]
FM6-12 In(1)FM6, P{lacW}F12, y[31d] sc[8] (ct[1?]) B[1]
FM7a In(1)FM7, y[31d] sc[8] w[a] v[Of] B[1]
FM7b In(1)FM7, y[31d] sc[8] w[a] lz[s] B[1]
FM7c In(1)FM7, y[31d] sc[8] w[a] sn[X2] v[Of] g[4] B[1]
FM7d In(1)FM7, y[31d] sc[8] B[1]
FM7h In(1)FM7, y[31d] sc[8] w[1] oc[1] ptg[1] B[1]
FM7i In(1)FM7, y[93j] sc[8] w[1] oc[1] ptg[1] B[1]
FM7j In(1)FM7, y[93j] sc[8] w[1]
FM7k In(1)FM7, y[31d] sc[8] sn[X2] B[1]
Insc In(1)sc[S1L]sc[8R]+dl-49, sc[8] sc[S1]
Inscy In(1)sc[S1L]sc[8R]+dl-49, y[c4] sc[8] sc[S1]
M6 In(1)sc[8]+dl-49, y[31d] sc[8] w[a] v[Of] f[1]
winscy In(1)sc[S1L]sc[8R]+dl-49, y[c4] sc[8] sc[S1] w[1]
CyO In(2LR)O, Cy[1] dp[lvI] pr[1] cn[2]
CyO, Tp(2;2)pk-sple[26] In(2LR)O, Tp(2;2)pk-sple[26], Cy[1] dp[lvI] pr[1] pk[pk-sple-26] cn[2]
SM1 In(2LR)SM1, al[2] Cy[1] cn[2] sp[2]
SM5 In(2LR)SM5, al[2] ds[55] Cy[1] lt[v] cn[2] sp[2]
SM6a In(2LR)SM6, al[2] Cy[1] dp[lvI] cn[2P] sp[2]
SM6b In(2LR)SM6, Roi[1], al[2] Cy[1] dp[lvI] cn[2P] sp[2]
SM6#16 In(2LR)SM6, Ab(2)SM6#16, al[2] Cy[1] dp[lvI] cn[2P] sp[2]
CxD In(3LR)CxD, D[1]
Dcxf In(3LR)DcxF, ru[1] h[1] D[1]
LVM In(3L)P, In(3R)P, l(3)LVML[1] pe[1] l(3)LVMR[1], Po[LVM]
MKRS Tp(3;3)MRS, M(3)76A[1] kar[1] ry[2] Sb[1]
MRS Tp(3;3)MRS, M(3)76A[1] ry[2] Sb[1]
Payne In(3L)P, In(3R)P
TM1 In(3LR)TM1, Me[1] kni[ri-1] Sb[sbd-l]
TM2 In(3LR)Ubx[130], emc[2] Ubx[130] e[s]
TM3 In(3LR)TM3, kni[ri-1] p[p] sep[1] l(3)89Aa[1] Ubx[bx-34e] e[1]
TM6 In(3LR)TM6, Hn[P] ss[P88] bx[34e] Ubx[P15] e[1]
TM6B In(3LR)TM6B, Antp[Hu] e[1]
TM6B-P In(3LR)TM6B, P{}, Antp[Hu] e[1] Tb[1] (P cytotype)
TM6C In(3LR)TM6C, e[1]
TM8 In(3LR)TM8, l(3)DTS4[1] th[1] st[1] Sb[1] e[1]
TM9 In(3LR)TM9, l(3)DTS4[1] th[1] st[1] Sb[1] e[1]
TMS In(3LR)TMS, M(3)76A[1] kar[1] ry[2] Sb[1] P{Delta2-3}99B