BIL 255 Chapter Notes - Chapter 9: Ciona, Alternative Splicing, Phylogenetic Tree
Document Summary
The ability to compare the genomes of a wide-ranging of organisms has provided striking conformation of darwin"s explanations for the diversity of life on earth. Evolution is more a thinker than an inventor, it uses raw materials the dna sequences that each organism inherits from its ancestors. There is no natural mechanism for making long stretches of entirely novel nucleotide sequences, thus no gene or genome is entirely new. Diversity is all the result of variations on preexisting themes. As genetic change piles up over millions of generations, they can produce radical change. If a gene got changed or mutated and it is the only gene present in the cell, the cell will not survive especially if it is an important gene that codes for something vital to the cell. The mechanism that generates genetic changes are the same for all living things. Mutation within genes: is the changes, deletion, or duplication of one or more nucleotides.
