When Researchers Analyzed the Remains of Tsar Nicholas II of Russia

Multiple Choice

When researchers analyzed the remains of Tsar Nicholas II of Russia and his family,they found that the suspected Tsar and his living great-grandniece Xenia differed at nucleotide position 16169 in the mitochondrial DNA.Retesting the remains showed that for this site in the mitochondrial genome,the purported Tsar had thymine (T) in some samples and cytosine (C) in others.The most likely cause of this finding is
2-14-2013

A) the samples were too old.
B) incomplete dominance.
C) pleiotropy.
D) heteroplasmy.