8/02/2016 Year 11 Science DEMONSTRATE UNDERSTANDING OF GENETIC VARIATION Achievement Standard: Science 1.9 ACHIEVEMENT OBJECTIVES: Living World Evolution Explore patterns in the inheritance of genetically controlled characteristics. Explain the importance of variation within a changing environment. TEXTS: Pd 1 (1 ) 2 & 3 4 ESA revision Guide (ESA) New Directions in Science (ND) Content Cells and Cell structure (plant and animal). This only needs the barest coverage as an introduction. Emphasise that all living things are made of cells. Define a cell and the role of the cell membrane, cytoplasm, nucleus, mitochondria, cell wall (plant), vacuole and chloroplast. Compare animal and plant cells. Emphasise the importance of the nucleus. Practical: Lock at onion cells (use iodine to stain) or cheek cells (use methylene blue to stain). Chromosome, Gene, DNA Show ‘How genes work’ video. Define chromosome, gene, DNA, nucleotide, alleles, DNA and their relationship to each other. Structure of DNA, covering phosphate, sugar (ribose) backbone and base rungs. (Adenine, Guanine, Cytosine and Thymine) Human karyotype Construct a human karyotype and identify sex from the karyotype. Reference ND p136-137 Ex 7F ‘How genes work’ video. Hmwk: ESA p67 Ex6A Karyotype to cut and paste. 6 weeks 8/02/2016 Year 11 Science 5 6 & 7 8 & 9 Two copies of every chromosome. Chromosomal disorders such as Downs, Turners and Kleinfelters. Cell Division: Mitosis Purpose is for growth and repair and to produce identical copies of the original cell. Describe effect on chromosome number (names of stages not required) and define homologous pairs. Discuss role of DNA in carrying instructions to next generation of cells so that daughter cells are identical to the parent cell. Sequence and label mitosis diagram (mixed up photos and diagrams in folder). Web task: http://www.biologycorner.com/worksheets/mito meo.html Cell Division: Meiosis Purpose is to produce sex cells with half the usual chromosome number. Mention the mixing of genes (crossing over), but there is no need to go into great detail. Discuss role of DNA from both parents in carrying instructions to next generation of animal/plant and how this results in genetic variation. Comparison between meiosis and mitosis. Discuss role that meiosis and sexual reproduction play in genetic variation in a population. Continuous vs Discrete Variation Define variation, continuous and discrete variation. Discuss the advantages of variation ND p138-139 Ex 7G Mitosis videos: http://videos.howstuffworks.com/search.php?terms=mitosis&me dia=video http://www.youtube.com/watch?v=AhgRhXl7w_g This website lists a number of other sites with good animations and photographs of cells undergoing cell division. Especially good are the links "Animal Cell Mitosis", “Mitosis in Onion Root Tips" and "PBS: How Cells Divide: Mitosis vs. Meiosis".http://www.emints.org/ethemes/resources/S00000759. shtml Hmwk: ESA p71 Ex6B ND p140-141 Ex 7H ACTIVITY: Cut and paste/rearrange meiosis diagram. Website: http://www.emints.org/ethemes/resources/S00000759.shtml Family patterns’ video Hmwk: ESA p74 ND p128-129 Ex7B ND Prac56 p16 ESA p79 8/02/2016 Year 11 Science e.g. evolution and natural selection. ACTIVITY: Measure height (or other continuous variation) and then graph results. Measure discrete variations. ACTIVITY: Variation in a Species worksheets (good) 10 , 11 & 12 Mendelian Genetics Background reading on Gregor Mendel’s work 13 ND p132-135 Ex 7D, 7E ND p142-143 Ex 7I ESA p80-84 Simple monohybrid inheritance To start punnet squares do Male and Female and ESA p75 find out why 50:50 ratio in population. Punnet square problems. Emphasise ratios Hmwk: ESA p84-89 and % of phenotype and genotype. Also that these are predicted outcomes, not what will always happen due to randomness of sex. Interpret pedigree charts (family trees). Define: gametes, zygote, complete dominance, recessive, homozygous, heterozygous, pure breeding, punnet square, phenotype, genotype (ratios), back or testcross and pedigree chart. (determination of sex) Sex linked inheritance of genetic problems Colour blindness. Carry out colour blindness test with class. Students read and carry out ‘Inheritance, a chancy game’ exercise (toss a coin rather than use dice). Haemophilia. Show the series of 3 Youtube clips on Queen Victoria’s legacy to the royal families Isihara colour blindness test: http://colorvisiontesting.com/ishihara.htm The Living World text (Relph et al) p66-67 Queen Victoria’s haemophilia bloodline: http://www.youtube.com/watch?v=sf5a1kPzKog 8/02/2016 Year 11 Science 14 15 16 & 17 18 19 of Europe. Mutations Define what a mutation is. Change to base sequence in DNA. Results in change in amino acid sequence. Can result in phenotype change. Sexual vs Asexual reproduction Why sex? Explain how sexual reproduction contributes to variety. Show ‘Why sex’ episode of video. Adaptations and natural selection Discuss how living things need to adapt to changing environments. Survival of the fittest and natural selection. Explain how useful characteristics are passed on to the next generation and how less fit individuals die before they can pass on their genes. Discuss the role of useful mutations as being responsible for special adaptations of species. Choose an animal and list adaptations and why those adaptations enable it to survive and eventually reproduce. Practical: Coloured toothpicks on the grass Living World (Relph) p62 ND p126-127 Video 192 ‘Evolution’. Episode ‘Why sex’. Show Brainbops animation: Natural Selection Life of Mammals – Show an episode and discuss the adaptations that help the animal survive and reproduce. Coloured toothpicks. selection pressure activity. Natural selection in penguins Use the Powerpoint to practise strategies to answer a typical exam question. Thrash out the key words/ideas then provide a scaffold for constructing meaningful sentences that answer the bullet points. Evolution Review classification of Kingdom Animalia In computer room use ‘Practise natural selection question’ literacy task K:\_2011 Science\Yr 11 Science\Powerpoints Show Brainbops animations: Six kingdoms 8/02/2016 Year 11 Science 20 21 22 23 http://www.abc.net.au/beasts/familytree/ to construct a ‘family tree’ for primates (monkeys, apes, humans). Discuss how classification tree can be used to determine how closely related groups of animals are based on when the branches of the tree diverge. Students to estimate the times (millions of years ago) that various mammal groups diverged. Case study Explain how useful mutations are selected for. Show ‘Evolution’ Powerpoint which uses evolution of elephants as a case study. Environmental vs genetic effects Discuss the role of environmental effects on phenotype. Design an experiment to test variation. Revision Complete fractured sentences revision exercise (literacy exercise). Envelope in folder or box in resource room. Test Vertebrates Mammals OHT Mammalian adaptive radiation (Megazostrodon) Mammal family tree: http://www.abc.net.au/beasts/familytree/ ‘Evolution’ Powerpoint in K-drive Living World (Relph et el) p56-57 Identical twins: http://videos.howstuffworks.com/tlc/28827understanding-genes-in-twins-video.htm Literacy activity: Fractured sentences in folder. Unit test