PPP_Ch. 9 - CHAPTER 9 Extranuclear Inheritance Dr....

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Unformatted text preview: CHAPTER 9 Extranuclear Inheritance Dr. Sanghamitra Mohanty 9.1 Organelle Heredity Involves DNA in Chloroplasts and Mitochondria 9.2 Knowledge of Mitochondrial and Chloroplast DNA Helps Explain Organelle Heredity 9.3 Mutations in Mitochondrial DNA Cause Human Disorders 9.4 Infectious Heredity Is Based on a Symbiotic Relationship between Host Organism and Invader 9.5 In Maternal Effect, the Maternal Genotype Has a Strong Influence during Early Development 9.1 Organelle Heredity Involves DNA in Chloroplasts and Mitochondria Some observations indicate an apparent extranuclear influence on the phenotype. With the discovery of DNA in mitochondria and chloroplasts, extranuclear inheritance is now recognized as an important aspect of genetics. 9.3 Mutations in Mitochondrial DNA Cause Human Disorders Heteroplasmy is the condition in which a deleterious mutation arises in an organelle, such that an adult will have cells with a variable mixture of normal and abnormal organelles. One variety of extranuclear inheritance is organelle heredity , in which DNA contained in mitochondria or chloroplasts determines certain phenotypic characteristics of the offspring....
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PPP_Ch. 9 - CHAPTER 9 Extranuclear Inheritance Dr....

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