inheritance5

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Unformatted text preview: 1 1. linkage maps pushed back to next section 2. non-Mendelian inheritance 3. practice problems Extranuclear inheritance Extranuclear Inheritance all eukaryotic cells have extranuclear genomes animals, fungi, etc. - mitochondria plants - mitochondria & chloroplasts non-Mendelian inheritance Example: leaf variegation phenotypes: green - normal chloroplasts varigated - mix white - no chlorophyll Example: leaf variegation phenotypes: green - normal chloroplasts varigated - mix white - no chlorophyll P female green x male varigated f 1 all green f 2 all green Example: leaf variegation phenotypes: green - normal chloroplasts varigated - mix white - no chlorophyll P male green x female varigated (reciprocal) f 1 green variegated white f 2 green variegated white 2 Example: leaf variegation example of maternal inheritance extrachromosomal inheritance from mother all our mitochondria come from our mothers Other Non-Mendelian Inheritance Maternal effect at Frst appears like maternal inheritance, but is caused by a different mechanism and produces different heredity patterns Genomic imprinting Maternal effect Example: Limnaea (water snail) dextral coiling (right) = s + dominant sinistral coiling (left) = s recessive Maternal effect s + s > P female s + s + (dextral) x male ss (sinistral) f 1 s + s (phenotype?) Maternal effect s + s > P female s + s + (dextral) x male ss (sinistral) f 1 s + s (dextral) Maternal effect s + s > P female s + s + (dextral) x male ss (sinistral) f 1 s + s (dextral) selfed (hermaphroditic) f 2 s + s + s + s ss + ss ? ? ? ? phenotypes? 2 Example: leaf variegation example of maternal inheritance extrachromosomal inheritance from mother all our mitochondria come from our mothers Other Non-Mendelian Inheritance Maternal effect at Frst appears like maternal inheritance, but is caused by a different mechanism...
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