mitosisandmeiosis_1 - Chromatids in 1 chromosome are...

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Mitosis and Meiosis Fast Facts n = n umber of chromosomes (ploidy) N = N umber of DNA molecules C = C ontent of DNA Somatic cell (before DNA replication) 2n – 2 of each chromosome, diploid 2N – 2 of each chromosome, 1 DNA molecule per chromosome 2C – twice the DNA content of a gamete (haploid cell) 46 chromosomes – 2 copies of 22 chromosomes (autosomes) + 2 sex chromosomes Gamete 1n – 1 of each chromosome, haploid 1N – 1 of each chromosome, 1 DNA molecule per chromosome 1C – DNA content of a gamete (haploid cell) 23 chromosomes – 1 copy of 22 chromosomes (autosomes) + 1 sex chromosome Mitosis Meiosis Before DNA replication: 1 chromosome = 1 chromatid = 1 DNA molecule. After DNA replication: 1 chromosome = 2 chromatids = 2 DNA molecules.
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Unformatted text preview: Chromatids in 1 chromosome are “sister” chromatids. Sister chromatids are held together at the centromere. Human genome information (in a diploid somatic cell, not including mitochondrial genome): Mass = ~6 pg Number of base pairs = ~3.2 billion Number of genes = ~20,000-25,000 Percentage of genome that consists of genes = ~2% Stage n N C Chromatids per chromosome Before DNA replication (G 1 ) 2n 2N 2C 1 After DNA replication (G 2 ) 2n 4N 4C 2 After mitosis (G 1 ) 2n 2N 2C 1 Stage n N C Chromatids per chromosome Before DNA replication (G 1 ) 2n 2N 2C 1 After DNA replication (G 2 ) 2n 4N 4C 2 After meiosis I 1n 2N 2C 2 After meiosis II (gamete) 1n 1N 1C 1...
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