Lec 3.19 - • In early development random x inactivation...

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Bio 11- 3/19/08 Transposons Parasites, super fast, prolific replication. Self expanding Very diverse, can mutate to create diveristy Can cause changes/deletion in genes by imposing themselves in different parts of the genes Non disjunction- chromatid do not separate and are drawn to the same pole Three chromosome 21- can be tollerated and causes down’s syndrome age of mother effects incidence of disease Females- XX one must be inactivated Male- only one Y
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Unformatted text preview: • In early development random x inactivation, becomes a bar body • Calico cats- all female caused by x inactivation • X active Paternal= Black pigment • X active Maternal= yellow pigment • X M X P embryonic cell seperates during division to form X m and X p cells and patches of black and yellow epidermal cells. • Heterochromatin= genetic innactivity...
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