Genes, Chromosomes, Protein Synthesis

Genes, Chromosomes, &

Protein Synthesis

By Dr. Carmen Rexach

Physiology Mount San Antonio College

DNA trivia

? Each diploid human cell contains approximately 2000mm of DNA

? The single largest human chromosome (remember...we have 23 pairs!) is 85mm in length and gets condensed into a structure 0.5m in diameter and 10m long when the cell divides

Eukaryotic Chromosomes

Highly condensed = about 100mg/ml

Chromatin and chromosomes

? Chromatin

? Organized units of DNA and protein present in cell during all phases except cell division

? Euchromatin

? Relatively decondensed chromatin accessible for use

? Heterochromatin

? Highly condensed chromatin that is transcriptionally inactive

? Chromosomes

? Highly condensed chromatin present when the cell is dividing

Chromatin vs Chromosomes

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