Скачать или смотреть MUTATION

 Mutation is a phenomenon which results in alternation in DNA sequences which consequently results change in the genotype and phenotype of an organism.
 In addition to the recombination mutation causes variations in DNA.
 According to Darwin variations or new trait appear suddenly.
 In 1791 SETH WRIGHT record ANCON SHEEP.
 Mutations are of two types point mutations and gene mutation.
 Point mutation change in the single base pair of a DNA example sickle cell anaemia.
 Gene mutation it changed in the chemical structure of a gene at molecular level.
 And we have two types of genes stable gene where mutation frequency will be low unstable gene where the mutation frequency will be high.
 Mutations are again divided into spontaneous and induced mutations spontaneous mutations arise suddenly without any known cause induced mutations are influenced by mutagens.