Question 4 - Principles of Inheritance and Evolution Video Lecture - NEET

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Asha number 7 a couple believe that they
have brought the wrong baby home from
the hospital the wife is gone and
husbands would be and the child group is
for food baby there's okay so now here
again we are given that the blood group
of wife is hope that means one who
didn't genotype it would be I am the
black hood for the husband is given as B
so what are the possible genotypes for
this it can be IV IV or it can be IV I
these are the two possible genotypes and
Chinese blood group is also Oh therefore
the genotype for child would again be I
had so we have to find out if a cross
happens which between this file and this
husband is it possible to have a child
with blood group O so let us consider
both the scenarios first we will cross
the wine with this genotype then we'll
cross the wife with this genotype so let
us consider here's one so we're here
crossing the wife with a possibility
that the husband is homozygous with this
so if this is what would happen the wife
can contribute this the husband can give
this so these are the only possible
options so if you will look at it all
the options which are possible here
would actually give you B blood group
right so the only possible options if
this is the mother and if this is the
father then the only possible option for
the blood group is going to be blood
group B right but in this case the baby
is not room or right so if the husband
is ozai this I di
that means the baby has twiglet people
when that is dissipated so in that if
this baby is not theirs now there can be
another scenario that's the husband is
heterozygous so in that case we can
cross them wife with the heterozygous
suspected this is how it is so the wife
can conjugal
III from husband you can get IV for I so
in that is these would be the possible
combinations so do you get out of this
can be I be I can be I I can be high or
it can be high so in that is there is
50% possibility that the blood route
would be poor and there is 50%
possibility that the blood route can be
B so in that is at least you have the
possibility that their offspring can
have left so in this case the child can
be there so he if the husband is
heterozygous but if the husband is
homozygous in that is this child is not
theirs so this is how we can actually
calculate then I want sort of learnt in
offsprings have a what sort of or blood
fulfil the parents have if we load our
group of the ah straight question number
eight in an experiment of an authentic
ratio of 3 is to 3 is to 1 is to 1 was
obtained in the offspring on cross and
yeah Lucy tall step that is capitalized
on by capital T small T when I hear
people I'm with yellow dwarf steel
variety determine the accuracy of this
data by punnett square ok so here what
was the cost that was being done this
was capital value smaller my capital T
small T and this was crossed with
Capital y small Y small teens for T so
this was not cross that must be done so
we have to actually find out if we are
able to get a phenotypic ratio of 3 is 2
choose 2 minus 2 1 or not so this we
will use punnett square but before using
we should be able to find out the gamut
so what are the possible gametes in this
case so possible damage would be capital
y capital t capital is one piece for my
capital kill small nice quality so in
this piece what are the possible talents
that we cover in one case one like this
one these are going to be unique gametes
that are possible here so now if you
just trying to design the punnett square
so what do we do so let us write down
all the gametes on the top row so these
are the galleries to become a cop first
row and the other cabins on the left
most column so this is what we did so
now we will try to prepare the various
formulations so this will be capitalized
quanti capital by capital T this will be
capitalized where the capitalized one
click this will be capitalized on use
for like activity this will be
capitalized only so on is wrong here you
will get twice monthly and capital by
gravity tell you it's for lies one thing
that determines one thing here you have
small flies much smaller by capital T
and your works more like swab just one
place one so these are the various
possible combinations now we have to
find out the various phenotypes so one
of the various phenotypes possible one
option could be en route or the other
option would be yellow dwarf so these
are the all possible phenotypes the
other option would be drilling oil and
the last option could be green what so
these are the all possible phenotypes so
that is how many do we have on each of
them so when we see yellow dot so how we
have yellow before yellow we want at
least one capital life but all we want
it least one captivity so this is one
going on if you have this is one yellow
dot because you have one capital by and
one capital G because this is the
dominant trait so yellow is dominant
over green similarly tall is dominant
over dwarf so in here you can have one
so three of them and y'know what four
years old war you should have at least
one capital life but for what you lose
one piece so here you can see you have a
pickle lying to spoil T's in there is -
you have one who have to wipe and
respond to you so this is one scenario
where you have one capital valiant
troops one piece in here also you have
one capital y equals one T so this also
you have three green at all so for do
you need to small like and for all you
want at least one capital T so here you
have two small right and one capital T
so this is yellow and one for green and
what you want everything because want
because it is a recessive trait so this
also you have one so you are
philosophically sure is three is to
change is to 1 is to 1 so this is
exactly the same as is given here so
this state filler typically sure which
is mentioned here is actuate question
number nine a black patent pop when red
with a white colored hen did you steal
you pellet offspring point and you let
him when the steel blew the lid off
Springs where in brain black white and
still valid approach anywhere object
this result systematically explained as
so the first sentence itself tells you
wanted this what is this an orbital what
so what do you have you have black
colored box so let us say present black
as WT WT and you cross it with white
colored hen so let us go through this
like this so now as for the little funky
dog is which is it is dominant should be
the same but here what is happening the
output is T blue color so that means the
output is a different color altogether
so they are all still you so which kind
of dominance explains is yes it is
incomplete dominance where none of the
trade actually dominates the other one
but an intermediate phenotype is okay so
this is all incomplete dominance
now in the second question it asks what
will be the expected ratio of black
blue-and-white region now we can say
that this is the f1 generation right
vesti blue coddled off stage introduced
now these delinquent offsprings are
inbred in brain means they were asked to
bring amongst themselves so steel blue
crossed with steel so that is what was
done so in that case what happened
so if this teal blue is red is still
blue right leg took the wrong worm
notation instead of the relational
tables on people that is how we will
hold it right so this would be swarming
so here also this is for me this goes
too small because I don't want to
clearly confusion by using different
locations so here one of the possible
gametes that can be produced after this
morning here what are the possible
gametes capital B spoil so now what are
the possible options these are the
possible combinations so what do we get
an option is capital B capital D an
option is capital B small B category
small D small D this morning so
basically this would be black this would
be white because one for Swami's and
these two will be steel so this group is
stable so if you look at the ratio the
ratio of black or humanity is the ratio
of black too steep to white would you be
back in student roles to mine so this
would be the ratio thank you please
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