Heteroplasmy is the presence of a mixture of more than one type of mitochondrial genome or chloroplast genome in the same cell.the statement is correct.
What is Heteroplasmy?
An individual is heteroplasmic when it has a mixture of two different populations of mitochondria or chloroplasts.
It is a phenomenon that occurs by the accumulation of errors during replication and by damage caused due to free radicals from the oxidative environment of the entire organelle.
It can be transmitted to offspring, if it occurs in gametic cells.
With this information, we can conclude that it is correct to say that heteroplasmy occurs when 2 different DNA sequences are found in the nuclear DNA.