Multiple Choice
Which of the following best explains why genes located in mitochondria and chloroplasts do not exhibit Mendelian patterns of inheritance?
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3. Extensions to Mendelian Inheritance
Organelle DNA
Multiple Choice
In eukaryotic cells, extrachromosomal DNA includes which of the following?
A
Histone genes packaged in nuclear chromatin
B
Centromeric satellite DNA on nuclear chromosomes
C
Ribosomal RNA genes located in the nucleolus
D
Mitochondrial DNA and chloroplast DNA
Verified step by step guidance1
Understand the definition of extrachromosomal DNA: it refers to DNA molecules that exist outside the main chromosomal DNA within a eukaryotic cell.
Identify the location of each DNA type mentioned: histone genes and centromeric satellite DNA are part of nuclear chromosomes, so they are chromosomal DNA, not extrachromosomal.
Recognize that ribosomal RNA genes, although located in the nucleolus, are encoded by nuclear DNA and thus are part of chromosomal DNA.
Recall that mitochondria and chloroplasts contain their own DNA, separate from the nuclear chromosomes, which qualifies as extrachromosomal DNA.
Conclude that mitochondrial DNA and chloroplast DNA are the correct examples of extrachromosomal DNA in eukaryotic cells.
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