L07 chapter 5-2 and 6

L07 chapter 5-2 and 6 - Genetics Bio 2306 Ch 5-2:...

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1 Genetics Bio 2306 Ch 5-2: cytoplasmic genetics Ch 6: human genetics, pedigree
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2 Cytoplasmic Inheritance Traits encoded by genes in the cytoplasm Mitochondrial genes and chloroplast genes Genes inherited only from female parent 
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3 Example: Stem color in                four o’clock flowers v + green (chlorophyll present) v - white (chlorophyll absent)
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Progeny look like seed plant (mother)
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variegated white green
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6 Cytoplasmic Inheritance in Humans Mitochondrial myopathies
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7 Genetic Maternal Effect Phenotype of offspring is determined by  genotype of mother Genes inherited from both parents, but  only maternal parent influences  phenotype
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Example - shell coiling in  the snail  Limnaea s + dextral (right-handed coil) dominant s sinistral (left-handed coil) recessive allele Genotype of maternal parent determines phenotype of offspring
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Look at mom’s genotype
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F1 phenotype not always the same as mother’s phenotype; Rather F1 phenotype represents mother’s genotype
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Many traits in mammals exhibit  genetic maternal effect
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L07 chapter 5-2 and 6 - Genetics Bio 2306 Ch 5-2:...

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