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A gene family has been accumulating nucleotide substitutions at a rate of 0.25 substitutions per million years.On average,there have been 80 substitutions between the common ancestor of this gene family and each of the various living forms of this gene.
-Based on these figures,this gene family likely originated _______ million years ago.
A) 20
B) 80
C) 160
D) 200
E) 320

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The Answer of Use the following to answer questions :
A gene family has been accumulating nucleotide substitutions at a rate of 0.25 substitutions per million years.On average,there have been 80 substitutions between the common ancestor of this gene family and each of the various living forms of this gene.
-Based on these figures,this gene family likely originated _______ million years ago.
A) 20
B) 80
C) 160
D) 200
E) 320

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