BIOA01H3 Lecture Notes - Antigen, Punnett Square, True Cross
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BIOA01H3 Full Course Notes
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Dna: molecule inside nucleus that gives instructions to make proteins etc. Base pair : at purines 2 rings. Base pair: cg purimidines 1 ring. Dna twists itself, then on histones, then histones twist to form chromatids. Chromosomes: human has 46, 23 pairs, 1 pair of sex chromosomes, 22 pairs of autosomes. Homologus: same instructions, but expressed in a different way. Homologs: single chromosomes that are similar but not the same. Centromere: middle region of chromosome, attracts spindle fibres. Chromosome = 2 sister chromatids held by a centromere = chromatin. N = haploid = # of unique chromosomes = human: 23. 2n = diploid = # of total chromosomes = human:46. G2: growth and prepares to divide or rest phase. Mitosis: somatic cells, daughter will be identical to parent. Metaphase: lines up in a row in the equator of the cell by spindle fibres. Anaphase: centromere splits apart, pulled by spindle fibres.