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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 human skin color now every
individual has different skin color
which are decided by the Elise today
let's study what are the combination
that takes place
Human Skin Color but I talk about human
skin color if I say that human skin
color is a polygenic trait but isn't it
traits out those traits whose expression
is brought about a pair of jeans or you
can say by a set of jeans
whenever a human skin color is been
decided if an individual has capital a
capital a capital B capital B and
capital C capital C then the set of
genes are denoted as duck skin color or
dark set of genes whereas all the small
alphabets do not light set of genes if
an individual seems to have capital is
small a capital B small B and small C
small C then that that individual is
heterozygous for all the genes and when
the individual is heterozygous for all
the gene the color mulatto is a color
that's in now depending upon the
homozygosity or the hetero zygosity
present in skin color every individual
skin colors weigh variations or
differences in characteristics in seen
through generations now heredity says
that certain traits are just passed from
generation to generation but in skin
color
yes skin color is passed from generation
to generation from parents to their
offsprings and then to their offsprings
but there is always certain changes
there's always certain permutation and
combination which is seen
human skin color now let's see human
skin color is basically controlled by
polygenic trait and when I talk about
polygenic trait these are nothing but
group of genes or you can say a set of
genes which decide a particular
characteristics for example skin color
is a particular trait or characteristics
present in human mix now this character
is decided by a set of genes or alleles
that you'd get from your parents both
your mother and father now half said you
get it from your father and half said
you get it from your mother that is why
human skin color is loudness of
polygenic trait each contribute to a
unit of darkness due to its incomplete
dominance the skin shade varies from
very dark that's capital a capital a
capital B capital P capital C capital C
individual who very light which is
denoted by small alphabets
a person but these sets of alleles is
always heterozygous for all the three
genes and will have an intermediate
color termed as mulatto
well as the number of possible
combinations that can be there in gamuts
is total AIDS we are seeing that so in
totality there are 64 phenotype
combinations that is 64 color variations
in skin color can be observed in human
beings
when two people of almost similar
genetic makeup marry each other so one
can be said that if two people who are
on the fence side but have slight
genetic makeup change they end up
marrying each other
there could be 64 different combinations
of skin color that could be obtained in
a long run one of the important features
of skin color definition is also the
atmospheric conditions
apart from that territorial boundaries
may also affect your skin color not the
same as the genetic makeup per to a
certain extent for example people
towards the poles tend to be on the
federal side due to the less amount of
Sun and more colder temperatures whereas
people in certain states of India tend
to be on the moon darker zone due to the
remedy condition of the food people in
Africa will have a certain skin color
due to the genetic inheritance or the
chains or gamuts a set of genes which
they tend to assign in this human skin
color trait what we can notice and
simple trick is that a particular skin
trait is decided by permutation and
combination of other alleles which have
basically all the polygenic traits which
you tend to have students in this part
of the chapter what we didn't study was
about the human skin color and how does
different combinations and permutations
happen in them I hope you are clear with
this concept of human skin color and its
polygenic effect entrance thank you
