Human mitochondria _____.? - Yahoo! Answers

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** Human mitochondria _____.? **

1. are all inherited from the mother

2. have linear DNA

3. are inherited as an X-linked trait

4. do not contain DNA

5. are all inherited


Source: answers.yahoo.com/question/index?qid=20110323104355AAn8VjA


how are human mitochondria inherited


Human mitochondrial genetics - Wikipedia, the free encyclopedia

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** Human mitochondrial genetics **

From Wikipedia, the free encyclopedia
Jump to: navigation, search
Human mitochondrial DNA.

*Human mitochondrial genetics* is the study of the genetics of *human
mitochondrial DNA* (the DNA contained in human mitochondria). The *human
mitochondrial genome* is the entirety of hereditary information contained
in human mitochondria. Mitochondria are small structures in cells that
generate energy for the cell to use, and are hence referred to as the
"powerhouses" of the cell.

Mitochondrial DNA (mtDNA) is not transmitted through nuclear DNA (nDNA). In
humans, as in most multicellular organisms, mitochondrial DNA is inherited
only from the mother's ovum. There are theories, however, that paternal
mtDNA transmission in humans can occur in certain circumstances.^[1]

Mitochondrial inheritance is therefore non-Mendelian, as Mendelian
inheritance presumes that half the genetic material of a fertilized egg
(zygote) derives from each parent.

Eighty percent of mitochondrial DNA codes for functional mitochondrial
proteins, and therefore most mitochondrial DNA mutations lead to functional
problems, which may be manifested as muscle disorders (myopathies).

Because they provide 30 molecules of ATP per glucose molecule in contrast
to the 2 ATP molecules produced by glycolysis, mitochondria are essential
to all higher organisms for sustaining life. The mitochondrial diseases are
genetic disorders carried in mitochondrial DNA, or nuclear DNA coding for
mitochondrial components. Slight problems with any one of the numerous
enzymes used by the mitochondria can be devastating to the cell, and in
turn, to the organism.

*Contents*

· 1 Quantity
· 2 Inheritance patterns
· 3 Genes

· 3.1 Electron transport chain
· 3.2 rRNA
· 3.3 tRNA
· 3.4 Location of genes

· 4 Genetic code variants
· 5 Replication, repair, transcription, and translation

· 5.1 Mitochondrial DNA polymerase
· 5


Source: en.wikipedia.org/wiki/Human_mitochondrial_genetics

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