Non-Nuclear DNA (Leaving Cert Biology): Flashcards

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Non-Nuclear DNA
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Location of non-nuclear DNA in cells

Mitochondria and chloroplasts

Alternative term for non-nuclear DNA

Extranuclear DNA

Abbreviation for mitochondrial DNA

mtDNA

Abbreviation for chloroplast DNA

cpDNA

Structure of non-nuclear DNA

Small, circular loops

Number of genes in mitochondrial DNA

Approximately 37 genes

Number of genes in chloroplast DNA

Approximately 100 genes

Inheritance pattern of non-nuclear DNA

Maternal inheritance

Why non-nuclear DNA shows maternal inheritance

Only sperm head enters egg; collar with mitochondria digested

Main function of mitochondrial DNA

Energy production

Main functions of chloroplast DNA

Photosynthesis and pigment formation

Organs affected by mtDNA disorders

Muscles, brain, heart (high energy demand organs)

Evolutionary theory supported by non-nuclear DNA

Endosymbiotic theory

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