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Download Topic 10: Genetics (HL)
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Transcript
Topic 10: Genetics (HL) Assessment Statement 10.1 Meiosis 10.1.1 Describe the behavior of the chromosomes in the phases of meiosis 10.1.2 Outline the formation of chiasmata in the process of crossing over 10.1.3 Explain how meiosis results in an effectively infinite genetic variety in gametes through crossing over in prophase I and random orientation in metaphase I. 10.1.4 State Mendel’s law of independent assortment 10.1.5 Explain the relationship between Mendel’s law of independent assortment and meiosis 10.2 Dihybrid crosses and gene linkage 10.2.1 Calculate and predict the genotypic and phenotypic ratio of offspring of dihybrid crosses involving unlinked autosomal genes 10.2.2 Distinguish between autosomes and sex chromosomes 10.2.3 Explain how crossing over between non-sister chromatids of a homologous pair in prophase I can result in an exchange of the alleles Notes 10.2.4 Define linkage group 10.2.5 Explain an example of a cross between two linked genes IB says: Alleles are usually shown side by side in dihybrid crosses, for example, TtBb. In representing crosses involving linkage, it is more common to show them as vertical pairs, for example: TB ________ ________ tb This format will be used in examination papers, or students will be given sufficient information to allow them to deduce which alleles are linked. 10.2.5 Identify which of the offspring are recombinants in a dihybrid cross involving linked genes IB says: In a test cross of TB ________ ________ tb the recombinants will be Tb ________ ________ tB and tB ________ ________ Tb 10.3 Polygenic inheritance 10.3.1 Define polygenic inheritance 10.3.2 Explain that polygenic inheritance can contribute to continuous variation using two examples, one of which must be human skin color What can be explained by crossing over? A. Alleles can be exchanged between non-homologous chromosomes B. Alleles can be exchanged between non-homologous chromatids C. Alleles can be exchanged between non-sister chromatids D. Alleles can be exchanged between sister chromatids QuickTime™ and a TIFF (LZW) decompressor are needed to see this picture. QuickTime™ and a TIFF (LZW) decompressor are needed to see this picture. QuickTime™ and a TIFF (LZW) decompressor are needed to see this picture.
