Answer: In the system can produce an unstable allele that is autonomous. can revert only in the Ac/ Ds Ac Ds presence of Ac and is nonautonomous. In the following, Ac+ indicates the absence of the Ac regulator gene. cross 1 P X C/cDS; Ac/Ac+ c/c; Ac/Ac+ F1 ¼ ( solid pigment) C/c; Ac/Ac+ ¼ ( solid pigment) C/c; Ac+/Ac+ ¼ unstable colorless or spotted) cDS/c; Ac/Ac+( ¼ ( colorless) cDS/c; Ac+/Ac+ Overall: 2 solid : 1 spotted : 1 colorless Cross 2 P X C/cAC c/c F1 (solid pigment) ½ C/c ( unstable colorless or spotted) ½ C/cAc Overall: 1 solid: 1 spotted Cross 3 P ; X ; C/cDS Ac/Ac+ C/cAc Ac+/Ac+ F1 1/8 (solid pigment) C/C ; Ac/Ac+ 1/8 ( solid pigment) C/CAc ; Ac/Ac+ 1/8 (solid pigment) C/C ; Ac+/Ac+ 1/8 (solid pigment) C/cAc; Ac+/Ac+ 1/8 (solid pigment) C/cDs; Ac+/Ac+ 1/8 (solid pigment) C/cDs; Ac+/Ac 1/8 (unstable colorless or spotted) cDs/cAc ; Ac+/Ac+ 1/8 (unstable colorless or spotted) cDs/cAc ; Ac+/Ac Overall: 3 solid : 1 spotted
Answer: In the Ac/ Ds system Ac can produce an unstable allele that is autonomous. Ds can revert only in the presence of Ac and is nonautonomous. In the following, Ac+ indicates the absence of the Ac regulator gene. cross 1 P C/cDS; Ac/Ac+ X c/c; Ac/Ac+ F1 ¼ C/c; Ac/Ac+ ( solid pigment) ¼ C/c; Ac+/Ac+ ( solid pigment) ¼ cDS/c; Ac/Ac+( unstable colorless or spotted) ¼ cDS/c; Ac+/Ac+ ( colorless) Overall: 2 solid : 1 spotted : 1 colorless Cross 2 P C/cAC X c/c F1 ½ C/c (solid pigment) ½ C/cAc ( unstable colorless or spotted) Overall: 1 solid: 1 spotted Cross 3 P C/cDS ; Ac/Ac+ X C/cAc ; Ac+/Ac+ F1 1/8 C/C ; Ac/Ac+ (solid pigment) 1/8 C/CAc ; Ac/Ac+ ( solid pigment) 1/8 C/C ; Ac+/Ac+ (solid pigment) 1/8 C/cAc; Ac+/Ac+ (solid pigment) 1/8 C/cDs; Ac+/Ac+ (solid pigment) 1/8 C/cDs; Ac+/Ac (solid pigment) 1/8 cDs/cAc ; Ac+/Ac+ (unstable colorless or spotted) 1/8 cDs/cAc ; Ac+/Ac (unstable colorless or spotted) Overall: 3 solid : 1 spotted
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