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Engineering HSC and IIT-JEE Mains an
advance videos. Hello students today we
are studying chapter genetic basis of
inheritance in that we are studying
topic multiple led if you break that
word multiple array it means different
kinds of a leaf or different set of
genes let's study about it.
now according to Mendel's theory or you
can say according to maintain your trait
or mental characteristics if we say in
all my terms
a gene will have two pair of alleles
each one else will have a gene for a
particular characteristics or a
particular trait and that each gene will
have two pairs of Ally now one pair of
is from your father another pair of
allele will be from your mother one
allele would be dominant another one
would be recessive the dominant allele
would be expressed in you and that is reseiv
one the dominant  when I say expressed
you it means you will show the dominant
characteristics
well then it's si one with higher but
how in certain cases this is not
followed
yes Torian this is just bifurcated in
certain cases when there are more than
two different and it's or you can say
more than two different and you know
motsek forms exist for a single gene
that is called as multiple is for
example the human blood group we all
know that there are four different kinds
of groups available a B a B and O now
for all this blood group five individual
shows different characteristics or you
can say different traits and there are
multiple and it's existing for each
Eclair group
that is the recessive group we all must
have heard about the Rh positive Rh
negative group now this is nothing but
multiple Allie the I a group I below
this are multiple le now multiple
alleles in blood grouping system
basically decide whether an individual
is going to be this as positive and this
is negative in simple language if I'd
tried to put this up for example if the
mother is a B and she's recess positive
the baby is own negative and his recess
negative during pregnancy there are
chances that if the mother's blood mixes
with the babies learn through the
umbilical cord or any other class in
tone ways there are chances that the
baby would develop antibodies to mother
or against mother black said and this
could affect the baby because the baby
has a min system and very lower level
but as the mother has completely
developed hardest this is how multiple
areas if collage of all line can affect
individuals whereas multiple aliens in
human blood grouping system are divided
another very distinct at the old place
giving each blood group a certain
characteristics whether one can donate
or whether one cannot
my simple alleles or different set of
alleys acondo Mendelian trait a gene or
you can say factor had only two alleles
that is one is the dominant one the
strong one and another one is the
recessive one however certain
characteristics or certain traits have
more than two different forms of L and
this a little moves exist in various
forms an example of this is the human
blood grouping system and this is called
as multiple allele ISM or multiple
alleles
human blood grouping system can have
four different types a me B a and O
times now we all know that a B is the
universal donor it can donate to
everybody fine Americans for different
blood groupings are illustrated they
have different phenotypic traits that is
they show different behaviors in
different individuals for example if the
blood group is compatible then you can
donate and incompatible blood rules can
not be donated if you try and donate
thinking that they are not too bad right
breast cells then your RBC's would
become destructive they would undergo
Lissa's at a rapid speed if you donate
and incompatible blood look from one
individual to another individual now all
these blood groups are depend determined
by three different sets of alleles and
this three sets a ia IB and IC row or IO
you can see a person who is caring ia
and IB that is a person who has every
blood group type synthesizes both the
glycoproteins that is you can say it
synthesizes both the antibodies that
straight wire now this individual
whether this is positive this is
negative whatever is this scenario can
donate blood groups
whenever blood donations or keep
transfer of blood from one individual to
another individual is seen the Rh
positive and Rh negative factor that is
also consider especially if a lady is
pregnant with this child that time is
positive an Rh negative plays a great
role now these two alleles are said to
be Co dominated that is they are in sync
with each other or dependent on each
other just for a particular trait or a
particular character students today we
did study about multiple alleles and how
for a particular gene you do not
necessarily have just two alleles that
could be certain genes or
characteristics in your body we could
have more than two different alleles I
hope you are clear with this concept of
multiple alleles
thank you
