Classify gene and chromosomal mutations, tell an autopolyploid from an allopolyploid and explain colchicine, and match each karyotype to Down's, Turner's, Edwards and Klinefelter's syndromes, albinism and haemophilia.
Unit 5 carries 6 of the 40 botany marks; with five chapters sharing them, this one averages just over one (MEC publishes weights by unit, not by chapter). The MEC scope line: Concept and types of mutation (gene and chromosomal); Importance of mutation; Polyploidy: origin, types and significance; Causes and examples of genetic disorders: Down's, Turner's, Edward's and Klinefelter's syndromes, albinism, haemophilia. Three ways it is asked:
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