The genome and gene expression
DNA, how it is read and regulated, and how it is shared out in mitosis and meiosis.
9 pages
- Central dogma of molecular biologyInformation flows from DNA to RNA and from RNA to protein; replication copies DNA and reverse…
- DNA structure and chromatinDNA is a double helix of two antiparallel strands held by base pairs; it wraps around histones…
- TranscriptionTranscription copies a DNA gene into an RNA molecule; in eukaryotes three RNA polymerases do it…
- RNA processing (cap, poly-A tail and splicing)Newly made RNA matures in the nucleus: it gets a cap and a poly-A tail and loses its introns by…
- Translation and the genetic codeIn translation the ribosome reads the mRNA three bases at a time (codons) and joins the amino…
- Control of gene expression in human cellsEvery cell has the same genes; what makes a liver cell different from a neuron is which genes…
- Cell cycle, mitosis and meiosisThe cell cycle is the sequence by which a cell grows, copies its DNA and divides; its brakes…
- Gametogenesis: spermatogenesis and oogenesisHow eggs and sperm are made: cells with half the chromosomes, ready to join at fertilization
- Meiosis and nondisjunction: where trisomies come fromWhen chromosomes fail to separate while eggs or sperm form, the embryo gets one too many or one…
This section is an index: it gathers pages from Biochemistry, Pathology, Embryology and other sections without repeating them. Educational content; it does not replace a geneticist's assessment or genetic counselling.
Representative model, for educational purposes only.