To determine the genotype of the red F2 individuals in cross 1, a test ... ...

To determine the genotype of the red F2 individuals in cross 1, a test cross could be done. What should be the genotype of the flies used in the test cross? Assume the symbol b+ indicates the wild type allele for the brown gene, while b indicates the mutation. A. b+b+ B. bb C. b+b D. XbXb and/or XbY
(A) Column A is larger
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in 19. Genetics