BIOL 200 Lecture Notes - Lecture 2: Mhc Class I Polypeptide-Related Sequence B, Nucleic Acid Sequence, Firmicutes
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Wrong nodes split into 3 instead of 2 - bifurcating (original one) As long as using unscaled trees, lines that end early (shorter lines) are not extinct. As lo(cid:374)g as pi(cid:272)ture fits data, it"s acceptable. Biological diversity measured in terms of species number. Definition of species = human construction: we decide what a species is. Species = interbreeding group of diploid reproductively isolated organisms that produce fertile offspring. Some genetic material may not come from parent. A collection of orga(cid:374)is(cid:373)s (cid:894)stai(cid:374)s(cid:895) (cid:272)hara(cid:272)terized (cid:271)(cid:455) a (cid:862)high(cid:863) degree of si(cid:373)ilarit(cid:455) i(cid:374) the nucleotide sequences of their genomes (genotypes) and their phenotypic properties. (cid:862)high(cid:863) (cid:448)aries fro(cid:373) spe(cid:272)ies fro(cid:373) spe(cid:272)ies depe(cid:374)di(cid:374)g o(cid:374) (cid:449)hat (cid:373)i(cid:272)ro(cid:271)iologists de(cid:272)ide. Docile e. coli k12 = in our intestines: coli o157:h7 = deadly but same species (20% more dna than k12) If a/t = 50% of bp, then g/c = g = 50% of bp. Prokaryotic world organized by placing organisms with similar ssu rrna nucleotide sequences into groups called phyla.
