Two autosomal genes control horn color in dragons. Pure-breeding gold-horned dragons were mated to pure-breeding silver-horned dragons. All of the F1 were gold. The F1 were intermated and the F2 generation consisted of 147 gold, 16 silver and 93 bronze. Choose the genetically based phenotypic ratio that should be hypothesized to explain the F2 data.

The correct option for the phenotypic ratio in this case is the following

9 : 6 : 1  

Explanation:

In order to calculate the ratio, divide the two larger numbers each by the smallest one - which here would be 17.

So, 147 ÷ 17 = 8.7 (rounded off to 9)

And 93 ÷ 17 = 5.6 (rounded off to 6)

This way, '17' is considered as 1. Hence,

Gold : silver : bronze

   9   :     6   :    1  

answer; i believe that the correct answer is(d) nondisjunction during meiosis;

not sure if this is what you'r looking for eubacteria and archaebacteria