the cat's body to result in Digital Genetic B3.21 Discuss the outcomes of the changed Students create a tally chart variation in plants video the Human Genome Project characteristic. and draw a frequency diagram. and its potential applications within Explain how mutations Eye colour is an inheritable medicine are really caused by feature (as a result of several mistakes in DNA, and genes), so there should be B3.22 State that there is usually that this changes the evidence of this in the results. extensive genetic variation allele of a gene, and so within a population of a the form of the Equipment: Images from the species and that these arise characteristic that the internet to identify the through mutations gene produces. following main iris colours: blue, grey, green, light B3.23 State that most genetic brown/amber, brown. Label mutations have no effect the images with their colours. on the phenotype, some Additional features in the iris mutations have a small may be seen in different effect on the phenotype colours, e.g. spots or rings of and, rarely, a single brown or yellow, and so may mutation will significantly need additional images if these affect the phenotype are being recorded. CB3f Variation B3.20 Describe the causes of Ask students to work in This practical provides an Write up a list of variation that influence pairs and to note down opportunity to consider genetic characteristics on the phenotype, including six examples of variation and environmental variation board, then draw a a genetic variation – in human characteristics. within one set of Venn diagram on the different characteristics as For each example, they characteristics, the shape and board of two a result of mutation and should identify how they form of leaves. intersecting circles. Add sexual reproduction vary (can the variations at least one be grouped, as in eye characteristic to each
B3.21 B3.22 B3.23 Discuss the outcomes of the Human Genome Project and its potential applications within medicine State that there is usually extensive genetic variation within a population of a species and that these arise through mutations State that most genetic mutations have no effect on the phenotype, some mutations have a small effect on the phenotype and, rarely, a single mutation will significantly affect the phenotype the cat's body to result in the changed characteristic. Explain how mutations are really caused by mistakes in DNA, and that this changes the allele of a gene, and so the form of the characteristic that the gene produces. Students create a tally chart and draw a frequency diagram. Eye colour is an inheritable feature (as a result of several genes), so there should be evidence of this in the results. Equipment: Images from the internet to identify the following main iris colours: blue, grey, green, light brown/amber, brown. Label the images with their colours. Additional features in the iris may be seen in different colours, e.g. spots or rings of brown or yellow, and so may need additional images if these are being recorded. Digital Genetic variation in plants video CB3f Variation B3.20 Describe the causes of variation that influence phenotype, including a genetic variation – different characteristics as a result of mutation and sexual reproduction Ask students to work in pairs and to note down six examples of variation in human characteristics. For each example, they should identify how they vary (can the variations be grouped, as in eye This practical provides an opportunity to consider genetic and environmental variation within one set of characteristics, the shape and form of leaves. Write up a list of characteristics on the board, then draw a Venn diagram on the board of two intersecting circles. Add at least one characteristic to each
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