Solution

Split genes are the genes that have protein coding regions (exons) interrupted by presence of non-coding DNA segments (introns). The exons are transcribed into RNA and finally translated into proteins. Errors in DNA replication and repair mechanism, chromosomal rearrangements, retrotransposition cause duplication of DNA segments which are forms of the natural basis for evolution. Lethal genes are one that cause premature death of the organism. The dominant lethal genes kill both heterozygotes and homozygotes while recessive one kill only homozygotes. The DNA sequences that move from one location on the genome to another are called transposable elements (TEs) or "jumping genes". Their movement may cause mutations and also can duplicate or reduce the amount of DNA in the genome of the cell.