MUTATION Dr Barnali Manna Deptt of Zoology Sarojini Naidu College for Women 7222020 DrBarnali Manna Different Eye colour 7222020 DrBarnali Manna Variation in hair colour ID: 931537
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SEMESTER VZOOACOR12T UNIT 3 MUTATION
Dr. Barnali MannaDeptt of ZoologySarojini Naidu College for Women
7/22/2020
Dr.Barnali Manna
Slide2Different Eye colour
7/22/2020Dr.Barnali Manna
Slide3Variation in hair colour
7/22/2020Dr.Barnali Manna
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Slide5Today’s learning objectivesWhat is Mutation?
Concept of MutationScientists related with Mutation Effect & Significance of MutationSpontaneous & Induced MutationSomatic & Germinal Mutation7/22/2020Dr.Barnali Manna
Slide6What is Mutation?Sudden heritable change in the genetic material is called mutation.
It is both to the change in the genetic material and to the process by which the change occurs.7/22/2020Dr.Barnali Manna
Slide7Mutation Theory Hugo de Vries
(1901) put forward a theory of evolution, called mutation theory. The theory states that evolution is a jerky process where new varieties and species are formed by mutations (discontinuous variations) that function as raw material of evolution.7/22/2020Dr.Barnali Manna
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Dr.Barnali MannaHermann Joseph Muller (1946)Discoverer of X-ray mutagenesis
Slide9Industrial melanismBiston
bitularia Biston carbonaria7/22/2020Dr.Barnali Manna
Slide10A basic Question- Nature of MutationIs mutation is a purely random event?
ORIs mutation directed by the environmental stress?7/22/2020Dr.Barnali Manna
Slide117/22/2020Dr.Barnali MannaJosuha & Esther Lederberg1952 Demonstrate random and non-directed nature of mutation through replica plating techniquehttps://evolution.berkeley.edu/evolibrary/article/side_0_0/lederberg_01
Slide12Effect of MutationThe whole human family is one species with the same genes. Mutation creates slightly different versions of the same genes, called
alleles. These small differences in DNA sequence make every individual unique. They account for the variation we see in human hair color, skin color, height, shape, behavior, and susceptibility to disease. Individuals in other species vary too, in both physical appearance and behavior.7/22/2020Dr.Barnali Manna
Slide13Spontaneous mutations are the result of errors in natural biological processes.Induced Mutations
are due to agents(mutagens) in the environment that cause changes in DNA structure. 7/22/2020Dr.Barnali Manna
Slide14Somatic Mutation: Mutation occur in somatic
cells,not be transmitted through the gametes.Germinal Mutation: When mutations occur in germ-line & transmitted to progeny. 7/22/2020Dr.Barnali Manna
Slide15Significance of mutation
Mutation is the ultimate source of all genetic variation, it provides the raw material for evolution.Some level of mutation is essential to provide new genetic variability to adapt to new environments.Alleles would not exist and organisms would not be able to evolve and adapt to environmental changes without mutation.7/22/2020Dr.Barnali Manna