BIOA01H3 Lecture Notes - Lecture 33: Mitochondrion, Pie Chart, Organelle
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Mitochondrial dna is only inherited from mother. X & y chromo"s arms tips share small region of homology but x gene @ x chromo ( 1000 genes) have counterparts @ y chromo ( 50 genes) -> recessive mutation @ x-linked gene expressed @ male. X-linked gene by morgan"s fruit y crosses: red-eyed f (dom) + white-eyed m (rec) -> red-eyed f + red-eyed m (recessive mutation) -> red-eyed f + red-eyed. M + white-eyed m => pattern of inheritance of white-eyed mutation = pattern of inheritance of x chromo. Male w/ x-inked rec trait (f: normal) : heterozygous/carrier daughter & normal son. Crisscross: x chromo - father -> daughter -> son. Heterozygous cross: (heterozygous f) half daughter: carrier & half sons: affected. Nondisjunction @ egg -> 1 2x chromo + 1 0x chromo -> 1 xxy female (white- eyed) + 1 xo male (red-eyed) => x xxx or oy cuz x survive.