Understandings:
3.2.U1: Prokaryotes have one chromosome consisting of a circular DNA molecule.
3.2.U2: Some prokaryotes also have plasmids but eukaryotes do not.
3.2.U3: Eukaryote chromosomes are linear DNA molecules associated with histone proteins.
3.2.U4: In a eukaryote species there are different chromosomes that carry different genes.
3.2.U5: Homologous chromosomes carry the same sequence of genes but not necessarily the same alleles of those genes.
3.2.U6: Diploid nuclei have pairs of homologous chromosomes.
3.2.U7: Haploid nuclei have one chromosome of each pair.
3.2.U8: The number of chromosomes is a characteristic feature of members of a species.
3.2.U9: A karyogram shows the chromosomes of an organism in homologous pairs of decreasing length.
3.2.U10: Sex is determined by sex chromosomes and autosomes are chromosomes that do not determine sex.
Applications:
3.2.A1: Cairns’ technique for measuring the length of DNA molecules by autoradiography.
3.2.A2: Comparison of genome size in T2 phage,Escherichia coli, Drosophila melanogaster, Homo sapiens and Paris japonica.
3.2.A3: Comparison of diploid chromosome numbers of Homo sapiens, Pan troglodytes, Canis familiaris, Oryza sativa, Parascaris equorum.
3.2.A4: Use of karyograms to deduce sex and diagnose Down syndrome in humans.
Skills
3.2.S1: Use of databases to identify the locus of a human gene and its polypeptide product.
Nature of Science
3.2.NOS: Developments in research follow improvements in techniques- autoradiography was used to establish the length of DNA molecules in chromosomes.
3.2.U1: Prokaryotes have one chromosome consisting of a circular DNA molecule.
3.2.U2: Some prokaryotes also have plasmids but eukaryotes do not.
3.2.U3: Eukaryote chromosomes are linear DNA molecules associated with histone proteins.
3.2.U4: In a eukaryote species there are different chromosomes that carry different genes.
3.2.U5: Homologous chromosomes carry the same sequence of genes but not necessarily the same alleles of those genes.
3.2.U6: Diploid nuclei have pairs of homologous chromosomes.
3.2.U7: Haploid nuclei have one chromosome of each pair.
3.2.U8: The number of chromosomes is a characteristic feature of members of a species.
3.2.U9: A karyogram shows the chromosomes of an organism in homologous pairs of decreasing length.
3.2.U10: Sex is determined by sex chromosomes and autosomes are chromosomes that do not determine sex.
Applications:
3.2.A1: Cairns’ technique for measuring the length of DNA molecules by autoradiography.
3.2.A2: Comparison of genome size in T2 phage,Escherichia coli, Drosophila melanogaster, Homo sapiens and Paris japonica.
3.2.A3: Comparison of diploid chromosome numbers of Homo sapiens, Pan troglodytes, Canis familiaris, Oryza sativa, Parascaris equorum.
3.2.A4: Use of karyograms to deduce sex and diagnose Down syndrome in humans.
Skills
3.2.S1: Use of databases to identify the locus of a human gene and its polypeptide product.
Nature of Science
3.2.NOS: Developments in research follow improvements in techniques- autoradiography was used to establish the length of DNA molecules in chromosomes.