The "trouble with tribbles" is they are ferocious multipliers. They are observed in two fur types, smooth or rough -- smooth is dominant to rough. They also have a pleasant soft voice or an unpleasant shrill voice. Pleasant voice is dominant to shrill voice. A series of genetic crosses are planned to determine whether the genes for these two characters are linked or unlinked. Dihybrid smooth-furred, pleasant voiced tribbles are crossed with rough-furred, shrill-voiced tribbles. The following phenotype frequencies are observed among the 11,692 offspring:a. 5011 smooth fur and pleasant voiced tribbles
b. 5110 rough fur and shrill voiced tribbles
c. 793 smooth fur and shrill voiced tribbles
d. 778 rough fur and pleasant voiced tribbles