190 know that in human cells the diploid number of chromosomes is 46 and the haploid number is 23 196 understand that variation within a species can be genetic, environmental, or a combination of both 197-198 understand that mutation is a rare, random change in genetic material that can be inherited 198-200 describe the process of evolution by means of natural selection 197 understand that many mutations are harmful but some are neutral and a few are beneficial 202 understand that resistance to antibiotics can increase in bacterial populations, and appreciate how such an increase can lead to infections being difficult to control Ecology and the Environment 212-213 understand the population, community, habitat and ecosystem 214-215 explain how quadrats can be used to estimate the population size of an organism in two different areas 214-215 explain how quadrats can be used to sample the distribution of organisms in their habitats. 216-217 explain the names given to different trophic levels to include producers, primary, secondary and tertiary consumers and decomposers 217-222 understand the concepts of food chains, food webs, pyramids of number, pyramids of biomass and pyramids of energy transfer
know that in human cells the diploid number of chromosomes is 46 and the haploid number is 23 190 understand that variation within a species can be genetic, environmental, or a combination of both 196 understand that mutation is a rare, random change in genetic material that can be inherited 197-198 describe the process of evolution by means of natural selection 198-200 understand that many mutations are harmful but some are neutral and a few are beneficial 197 understand that resistance to antibiotics can increase in bacterial populations, and appreciate how such an increase can lead to infections being difficult to control 202 Ecology and the Environment understand the population, community, habitat and ecosystem 212-213 explain how quadrats can be used to estimate the population size of an organism in two different areas 214-215 explain how quadrats can be used to sample the distribution of organisms in their habitats. 214-215 explain the names given to different trophic levels to include producers, primary, secondary and tertiary consumers and decomposers 216-217 understand the concepts of food chains, food webs, pyramids of number, pyramids of biomass and pyramids of energy transfer 217-222
biology_igcse_detailed_checklist_triple_final.docx