Exam 2 L4 - Cell cycle and Meiosis

Exam 2 L4 - Cell cycle and Meiosis - Cell Cycle Some basic...

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Cell Cycle Some basic concepts: - DNA is a polymer of nucleotides - Genome: the complete set of DNA in an organism - Role of DNA: the sequence of nucleotides in DNA represents the sequence of amino acids in a protein - Gene: A sequence of DNA that codes for the production of a single protein. (A gene is a recipe for a protein) - Chromatin: DNA is complexed with (wrapped up with) a protein in cell nucleus - Chromosomes are like pairs of books - you get one volume of 23 from mom, another volume of 23 from dad. (Each has the same set of hereditary instructions - for hair color, eye color, etc). - These (above) are referred to as “homologous chromosomes” - Sex Chromosomes: Females have set of chromosomes that are “XX” – which are homologous (so: a total of 23 pairs of homologous chromosomes). Males have a set of chromosomes that are “XY” (so: only 22 pairs of homologous chromosomes and one non-homologous pair). The Cell cycle: - Cell growth, DNA replication, cell division - two phases: mitotic and interphase - S Phase = DNA replication - G2 Phase = DNA begins to condense
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Exam 2 L4 - Cell cycle and Meiosis - Cell Cycle Some basic...

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