ExplanationA. True. Trisomies of other chromosomes died earlier than trisomy 19.B. False. Chromosomes 1,6, 10 are different in size but their trisomies died at the same day (day 12th) indicate that total amount of additional genetic material donot determines the severity of the defects associated with the chromosomeimbalance. Only number of genes on chromosomes determines the lethality.C. True. Chromosome 1 is the largest but trisomy I died at the same time as trisomy 10.D. True. Chromosomes 12 and 13 are of similar size. However trisomy ofchromosome 12 dies earlier than that of chromosome 13. Therefore genes onchromosome 12 are probably more important for embryo development than thoseon chromosome 13.Reference: Eduardo M. Torres, Bret R. Williams and Angelika Amon. Aneuploidy:Cells losing their balance.