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Are linked genes, crossing over, recombinations and gene mapping included in Unit 4 Area of study 1 Heredity (sixth bullet point, p. 27)?

April 26, 2017area crossing gene genes included linked Mapping

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Are linked genes, crossing over, recombinations and gene mapping included in Unit 4 Area of study 1 Heredity (sixth bullet point, p. 27)?

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Response: Sex linked inheritance relates to a single character (i.e. a gene) only on a sex chromosome. Dihybrid crosses concerns two genes carried on different pairs of chromosomes (the principle of independent assortment only). Crossing over occurs in meiosis and that crossing over is one of the causes of variation. Crossing over results in recombinations. Students will be expected to understand recombination of two linked genes only. Students will NOT be expected to calculate the percentage of recombinants nor determine a gene map. The Hardy-Weinberg law is not required.