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Engineering HSC and IIT-JEE Mains and
Advanced videos. Hello students today we
are studying in chapter origin and evolution
and that we are Studying topic mutation
theory of evolution
now mutation theory of evolution was
given by a botanist known as cube to
various and notation theory has very
coreelation with chemical theory
so let's Study and find out how
mutation theory of evolution given by
botanist hue dowrest this is also known as
organic theory of evolution or theory of
evolution which gradually changes now he
proposed this theory by studying of
plant species and this plant was nothing
but evening primose he also stated
that mutation was the law of nature
now mutations according to him could be
of different kinds there could be
positive mutations or negative mutation
and all the mutations has no going back
or deletion mutations try and express
their characters which could be dominant
or recessive so he didn't knew the term
dominant recessive homozygous and
heterozygous but he tried to employ or
imply mutation as a process which was
never going back
it only produced offspring having that
particular character
now according to theory of mutation what
happens is that it was proposed by Dutch
botanist Hugh do this in the year 1848
to 1935 and he explains that the process
of evolution is and precise organic
evolution here so that certain striking
features of evolution in a plant that he
started which was a evening Primus now
this certain characteristics suddenly
appeared in Midway from nowhere
so basically they were just a gradual
change
you
what my vision can clearly sees is that
this new traits or traits which were
formed eventually are also called as
bred true now they're the traits that I
eventually found in that organism and
will show its signs he also called this
phenomena as mutation and change the
forms as mutants or you can say replicas
that a mutation means sudden changes
that were taking place in the genetic
material or you simply say the DNA or
chromosomal level of a particular
organism and those changes were always
heritable when I say heritable it means
that could be passed from one organism
to another set of organism so students
in this part of the chapter would be
trying to understand was that how this
mutation theory works and what are the
different parameters that worked on
mutation can I have students you are
very clear with this concept of mutation
theory thank you
