Biology 1001A Lecture Notes - Lecture 1: Myriapoda, Pteridophyte, Tardigrade
19 Feb 2016
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Differences that matter are (usually) differences in dna. All branches come down to dna sequence. A genome is all of the dna sequence in one copy of an organism"s chromosomes. Plants have nuclear genome, mitochondrial genome, and a chloroplast genome. When we talk about genomes in general we are talking about nuclear genomes. The amount of dna in one copy of a genome is called c . The c-value enigma : c is not for complexity . No relationship between genome size and complexity: one copy of all chromosomes equals 1 c value o. Almost all archaea and bacteria have circular chromosomes. Linear chromosomes are (almost) only found in eukarya. 1 set of chromosomes is one c value. Xs: only during metaphase of cell division are chromosomes compacted enough to look like xs, dna wraps around nucleosomes, packaged into chromosomes. A chromosome is packaged chromatin: dna plus proteins: each chromatid is one molecule of dsdna.
