1Disorders due to Chromosome Numbers Biology 1F25for Biology Non-MajorsLecture 20Background Reading•Textbook, Chapter 18.The People Who Prepared This LectureHarry PeeryAlan CastleChris Burke•Born in 1965 in New York State.•Parents were told by doctors to institutionalize him as he would never amount to anything.•They said he would always be mentally retarded.•They said had a form of idiocy and would always be a drain on family resources.
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2Today•It is the doctors who had the idiocy – Chris Burke is an actor, he is very self-sufficient and has a very good income. He speaks all over the world. •Here he is with his band.What Did Chris Burke Have?Interlude: Cell Cycle and Mitosis and MeiosisTypes of Cell DivisionCell Cycle•There are 4 stages in the life cycle of a cell– G1stage is for the first gap between the end of telophase and the beginning of DNA synthesis. G0is a G1gap that never ends.– S stage is for synthesis of DNA (the DNA replicates)– G2stage is for the second (and very short) gap between S stage and beginning of mitosis– M stage is for mitosis and results in two daughter cells.Interphase