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ib biology neuroscience meiosis crossing over biology genetics photosynthesis animal behavior angiosperm macromolecule evolution natural selection charles darwin pedigree chart sex linkage monohybrid cross topic 31 structure dna topic 41 chromosomes mutations alleles genes 42 101 recombination gene linkage chiasmata cell cycle mitosis cell division plant reproduction plant fertilization learned innate neurotransmitters synapses stimulus response plant transport calvin cycle light independent reactions light dependent reactions carbohydrate lipid protein water