Root tip squash photo


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Mutations lesson

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- Discussion of the broad categories of mutations (chromosome and gene) - Division of gene mutations into point and indel mutations - Division of point mutations into silent, missense and nonsense mutations (with examples) - Comparisons of the varying effects of the different types of mutations, with indel and nonsense often being the most detrimental - indel mutations cause a FRAME SHIFT in most circumstances meaning that every subsequent triplet is affected by the mutation - Discussion of the need for differential gene expression - this allows cells to become SPECIALISED - they need to express different genes at different times - Discussion of the different types of gene expression control/regulation: 1. Transcriptional 2. Post-transcriptional 3. Post-translational HOMEWORK - revise for mutations quiz, complete the mutations questions sheet and complete the year 12 PLC and bring on a USB
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Endotherms and Ectotherms lesson summary

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Recap of the meanings of homeostasis, negative feedback and positive feedback Sorting of a range of communication pathways into positive and negative feedback: POSIVE - propagation of an action potential, oxytocin release during childbirth; NEGATIVE: temperature control in humans, control of blood water potential in humans Use of video to introduce difference in lifestyle between different organisms: Note that the lizard can move rapidly over short distances but cannot maintain a high level of activity - it mainly relies on AMBUSH PREDATION which is powered largely by anaerobic respiration. Its body temperature varies with the varying temperature of the environment - it is an ECTOTHERM The shrew on the other hand is always ready for large amounts of activity by having a high metabolic rate and a constantly high internal temperature - it is an ENDOTHERM Summary of the benefits and drawbacks of endothermy and ectothermy Summary of the BEHAVIOURAL and PHYSIOLOGICAL ada...
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