Variations Video Lecture - NEET

hello friends this video on principles
of inheritance part 39 is brought to you
by exam feel calm
no more fear from exam so now that we
have discussed about mutations as well
as recombinations it is time to
introduce variations now whenever
mutation happens or whenever
recombination happens what happens we
see new varieties in the box base we see
new traits are you callicles the
obstacle and that is what we call as
validation that needs to change changes
which we see in the ox tail so you talk
about any organism so if you talk about
organisms by choosing sure the
production take place for example amoeba
or Hydra East so they are also the
reproduction happens by either fission
or a budding these are the methods which
they use for their reproduction but even
in these vintage what happened is be any
copy makes plays like the DNA gets
copied that is what happens when you are
you clears divides to form two nuclei so
basically that ink material inside the
nucleus is also getting divided so the
DNA is giving copy so during the copying
of this DNA some errors can occur by
chance and these small errors can give
rise to variation in the off stage
so this is our variation comes into play
given in case of organisms which
reproduce like asexual reproduction you
can see let us presume this pose or
instrument in your hand this is the pop
in DNA so there is a swarm ll1 for me
and this air since the sequence has
changed a sizable cooking so the trade
will be different so it with a new
option which will be formed in have some
new places and that is what we call as
salvations so here you can give an
example anyone so if you see this amoeba
has a slightly lower arm here and as I
will cook it
and everybody's business and this is
what is variation slowly a sexual
reproduction event in case of sexual
reproduction very chancy so that is what
we will see
so what you talk about any of the
animals whether it is elephant or fishes
or giraffe or through means everywhere
or offsprings look similar to them
because they have their basic body
structure and designs of it into their
parents but they are not always exactly
identical so a baby elephant blue
something looks like an elephant so it
has got the basic structure like that
but it is not exactly identical there
might be something changes in maybe in
the shape of the ears or in the shape of
the trial court somewhere some changes
might be there so the very similar way
even in piece of human beings each one
of us we might resemble one of our
parents or we might have something
change which we have been needed from
them and at the same time we also have
quite a few new characters and those new
characters which are seen they are
variation so from where does this
radiation come into picture because when
the sexual reproduction happens what
happens this form and the ovum or the
egg they both fuse together so what do
those forms are swarms are presently
draw us from satisfied autosomes plus
months wait for ozone similarly the
implosion a friend who got two rooms
because one set form so these two will
combine with each other to form the
zygote which will later form the
offspring right so now for each of these
many pairs of autosomes each of ten we
have one set of clothes so these two
second four zones will come I am aware
of who knows frozen right so now these
Google of the straw oceans combined
together or in these gangs and form this
teach of these focus which we have
already I have got some sort of Prosecco
versus what
Nations there what are you thinking is
so some weeks need some updates we have
all you need for having okay and once
again my personal mutations you read a
process of cell division and all of
these things will impound water
variations which we'll be seeing in the
next generation so this is how angry
should take space so the two important
processes which give rise to variations
are three combinations which have a new
to the process of crossing over to
meiosis so the population is one
phenomenon responsible for their nation
and the same thing which is responsible
for variation is creation that is a
change in the gene on chromosome
structure and number now that is why we
see that if you compare if you consider
a lumen Covenant right so here you see
their kids they have so many
similarities with their parents because
these genes have been inherited as it is
similarly they also if you see they have
the exact similarities but there are few
treats which are completely new like the
blue eyes none of the parents have blue
eyes it from where we compromise not
maybe one of these patents hand a
recessive trait for the fluence or maybe
it was presently a one with his
grandparents so which was a hidden tail
in one of his friends is there any
reason and difficulty combination maybe
some like we see complete dominance
alright so some sort of blending would
have happened and if you color this one
so there are many ways by which new
clips and perform but these new traits
which our scheme they are come as
variations so this is how variations of
view changes as seen in an organism and
sometimes if these variations are
helpful for the survival of the organism
sometimes they become a part of it for
example when this guy has you guys later
there is a good amount of possibility
best that few screens might also have
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