which of the following statements is true of a heteroplasmic gene?
a. Heteroplasmic genes have Mendelian inheritance patterns.
b. A heteroplasmic gene is found in multiple allelic forms within the nuclear genomes of different cells of an organism.
c. All copies of this nuclear gene are identical.
d. A heteroplasmic gene is found in multiple allelic forms in DNA molecules that make up the genomes of organelles in the cells of an organism.