B4.1h describe the differences SB9b energy transfer 178  between the trophic levels of organisms within an ecosystem B4.1i pyramids of SB9b energy transfer 178, 179 describe biomass and explain, with examples, how biomass is lost between the different trophic levels B4.1j calculate the efficiency of SB9b energy transfer 179  biomass transfers between trophic levels and explain how this affects the number of trophic levels in a food chain BM4.1i calculate rate changes SB9m rates of decomposition 203 worked example  in the decay of biological material BM4.1ii calculate the percentage SB9b energy transfer 179 of mass BM4.1iii Use fractions and SB9b energy transfer 179 percentages BM4.1iv plot and draw none found in this appropriate graphs selecting section appropriate scales for the axes BM4.1v extract and interpret SB9d biotic factors & 185 extend question information from charts, graphs communities and tables Topic B5 Genes, inheritance and selection B5.1 Inheritance B5.1a explain the following terms: SB3b meiosis 52, Gamete, chromosome gamete, chromosome, gene, SB3g alleles 64, 65 gene allele/variant, dominant, allele dominant recessive, homozygous, recessive heterozygous, genotype and homozygous phenotype heterozygous genotype phenotype B5.1b describe the genome as SB3b meiosis 52 the entire genetic material of an organism B5.1c describe that the genome, SB3b meiosis 52, and its interaction with the SB3k variation 72 environment, influence the development of the phenotype of an organism B5.1d Recall that all variants arise SB3e genetic variants and 60, 61, eye colour weight and from mutations, and that most phenotypes 70 height not given as have no effect on the phenotype, SB3j gene mutation examples some influence phenotype and a very few determine phenotype B5.1e describe how genetic SB3d protein synthesis 59,  variants may influence SB3e genetic variants an 60, 61 phenotype: phenotypes in coding DNA by altering the • activity of a protein in non-coding DNA by altering • how genes are expressed
B4.1h  describe the differences between the trophic levels of organisms within an ecosystem SB9b energy transfer 178 B4.1i describe pyramids of biomass and explain, with examples, how biomass is lost between the different trophic levels SB9b energy transfer 178, 179 B4.1j  calculate the efficiency of biomass transfers between trophic levels and explain how this affects the number of trophic levels in a food chain SB9b energy transfer 179 BM4.1i  calculate rate changes in the decay of biological material SB9m rates of decomposition 203 worked example BM4.1ii calculate the percentage of mass SB9b energy transfer 179 BM4.1iii Use fractions and percentages SB9b energy transfer 179 BM4.1iv plot and draw appropriate graphs selecting appropriate scales for the axes none found in this section BM4.1v extract and interpret information from charts, graphs and tables SB9d biotic factors & communities 185 extend question Topic B5 Genes, inheritance and selection B5.1 Inheritance B5.1a explain the following terms: gamete, chromosome, gene, allele/variant, dominant, recessive, homozygous, heterozygous, genotype and phenotype SB3b meiosis SB3g alleles 52, 64, 65 Gamete, chromosome gene allele dominant recessive homozygous heterozygous genotype phenotype B5.1b describe the genome as the entire genetic material of an organism SB3b meiosis 52 B5.1c describe that the genome, and its interaction with the environment, influence the development of the phenotype of an organism SB3b meiosis SB3k variation 52, 72 B5.1d Recall that all variants arise from mutations, and that most have no effect on the phenotype, some influence phenotype and a very few determine phenotype SB3e genetic variants and phenotypes SB3j gene mutation 60, 61, 70 eye colour weight and height not given as examples B5.1e  describe how genetic variants may influence phenotype: • in coding DNA by altering the activity of a protein • in non-coding DNA by altering how genes are expressed SB3d protein synthesis SB3e genetic variants an phenotypes 59, 60, 61