a) What problems can result from each of these types of chromosome rearrangements? (SHOW WORK & EXPLAIN) b) Give examples of human aneuploidies including which chromosome has an extra copy, the name of the resulting syndrome, symptoms, incidence and life expectancy. (SHOW WORK & EXPLAIN) c) Define continuous characteristic, polygenic characteristic, pleiotropy and multifactorial characteristic. Solution a. 2. Trisomy 21 - extra chromosome in the 21st chromosome causing downs syndrome. Trisomy 18- extra chromosome in 18 th chromosome. Known as Edwards syndrome. Trisomy 13 - Patau syndrome Turners syndrome. Klinefelters syndrome..