In eukaryotic cells, which statement best describes a key difference between nuclear DNA (nDNA) and mitochondrial DNA (mtDNA)?

• A. mtDNA is located in the nucleus and is replicated only during S phase, whereas nDNA is located in mitochondria and replicates continuously.
• B. mtDNA is typically inherited maternally and is usually circular, whereas nDNA is typically inherited from both parents and is organized as linear chromosomes.
• C. mtDNA is packaged into histones and contains most of the organism’s genes, whereas nDNA lacks histones and encodes only a few proteins.
• D. mtDNA undergoes meiotic recombination each generation at high rates, whereas nDNA does not recombine.

Answer: (B)

Verified step by step guidance

1. Identify the location of nuclear DNA (nDNA) and mitochondrial DNA (mtDNA): nDNA is found in the nucleus, while mtDNA is located in the mitochondria.
2. Understand the inheritance patterns: nDNA is inherited from both parents (biparental inheritance), whereas mtDNA is typically inherited only from the mother (maternal inheritance).
3. Recognize the structural differences: nDNA is organized into linear chromosomes, while mtDNA is usually circular in structure.
4. Consider the packaging of DNA: nDNA is wrapped around histone proteins forming chromatin, whereas mtDNA is generally not associated with histones.
5. Review the recombination and replication characteristics: nDNA undergoes recombination during meiosis, but mtDNA does not typically recombine and replicates independently of the cell cycle.