InUrsa gummi, the famed Gummy Bear soldiers, a quality that is sought is bravery (dominant phenotype). The recessive phenotype is timidity or conformity. The alleles and genotypes corresponding to these phenotypes at two loci are presented below.
A_ codes for brave;
aa codes for timid/conforming;
B_ codes for brave;
bb codes for timid/conforming.
What is the phenotypic ratio of brave:timid offspring from a cross betweentwo doubly heterozygousUrsa gummi, if the mode of inheritance is duplicate recessive epistasis?
A 15:1.
B 12:3:1.
C 1:15.
D 9:7.
E 4:12.