chap_16-1

chap_16-1 - Chapter 16 Non-Mendelian inheritance Chapter 16...

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Unformatted text preview: Chapter 16 Non-Mendelian inheritance Chapter 16 problems: 7, 9, 12, & 13 Leber’s hereditary optic neuropathy (LHON) Maternally inherited disease resulting from a mutation in a mitochondrial gene that causes reduced ATP synthesis Non-Mendelian inheritance • Also called uniparental inheritance – Inheritance from only one parent (usually maternal) – Involves genes found in organelle genomes • Mitochondria • Chloroplasts What causes uniparental inheritance? 1. Differences in gamete size 1. Preferential mechanisms i. Only sperm nucleus can enter the egg (tunicates) ii. Zygote destroys the paternal organelles! (urchins) iii. Unequal cytokinesis during spermatogenesis excludes mtDNA from sperm Chloroplasts and Mitochondria • Eukaryotic organelles that have their own genomes • Chloroplasts – capture solar energy and store it in carbohydrates • Mitochondria – release energy from carbohydrates and convert it to ATP Mitochondrion Chloroplast chromosomes Organelle genome characteristics...
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This note was uploaded on 02/03/2011 for the course BIOL 2153 taught by Professor Larkin during the Fall '03 term at LSU.

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chap_16-1 - Chapter 16 Non-Mendelian inheritance Chapter 16...

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