Biology 1202B Lecture Notes - Fade, Centromere, Histone Deacetylase
2 Jun 2012
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Lecture 5: control of gene expression ( chapter 15) - murphy lecture. Human egg when released from the ovary is almost completely inactive metabolically. Within seconds of the egg & the sperm meeting, rapid cell division. Divisions produce cells of the body with specialized cells that differentiate with specialized functions. * 23 chromosomes in an egg, through those divisions, daughter cells have identical dna but different proteins resulting in different specialization. Every nucleated cell of the body contains the same dna template and genes. * nucleated = cell that has a nucleus, i. e there are nucleus and dna within these cells structurally and functionally there are differences between cells and what they express. Structural & functional differences in cell types result from the presence or absence of the products,i. e. which genes are transcribed? which genes are translated? rather than the ac- tual presence of genes themselves on dna. It is not enough just to have a gene present in dna.
