Topic 3.2 Chromosomes Survey of Knowledge
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  1. 3.2.U1 Prokaryotes have one chromosome consisting of a circular DNA molecule.
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  1. 3.2.U2 Some prokaryotes also have plasmids but eukaryotes do not.
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  1. 3.2.U3 Eukaryote chromosomes have linear DNA molecules associated with histone proteins.
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  1. 3.2.U4 In a eukaryote species there are different chromosomes that carry different genes.
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  1. 3.2.U5 Homologous chromosomes carry the same sequence of genes but not necessarily the same alleles of those genes.
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  1. 3.2.U6 Diploid nuclei have pairs of homologous chromosomes.
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  1. 3.2.U7 Haploid nuclei have one chromosome of each pair.
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  1. 3.2.U8 The number of chromosomes is a characteristic feature of a member of a species.
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  1. 3.2.U9 A karyogram shows the chromosomes of an organism in homologous pairs of decreasing length.
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  1. 3.2.U10 Sex is determined by sex chromosomes and autosomes are chromosomes that do not determine sex.
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Linda Kilch