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Dominant and recessive traits in humans
Dominant and recessive traits in humans
   There are over 200 traits that are transmitted
    from generation to generation in humans.
    These interesting aspects of human genetics are
    known as hereditary traits
Dominant and recessive traits in humans
There are two or more variations in most of
the genes called alleles. An individual can
inherit same pair of alleles or two different
pairs of alleles. When there are two different
alleles, they are expressed in a different way.
The trait that is expressed in case of two
different alleles, gives rise to the dominant
and recessive traits in humans. When a
dominant allele is present, it is always
observed that the dominant trait is expressed.
The recessive trait is observed only in case
there are two recessive alleles present.
Common Dominant and
Recessive
     Traits in Humans:
Widow's Peak:
The widow's peak allele is dominant and the
straight allele is recessive.
Bent Pinkie:
You can try to bend your pinkie finger inwards
towards your ring finger or fourth finger. If you are
able to do so, it means you have inherited the
dominant version of the gene that causes the distal
segment of the pinkie to bend.
Dominant and recessive traits in humans
Crossing of Thumbs:
Do you find your left thumb crossing
your right thumb? If yes, then you
probably have inherited 1 or 2 copies of
the dominate gene. In case of 2
recessive genes inherited, you will find
your right thumb placed over your left
thumb.
Dominant and recessive traits in humans
Earlobe Attachment:

Some people have their ear lobes
attached to the side of the head and
some people have free ear lobes. This is
due to a gene that is dominant for
unattached ear lobes and recessive in
case of attached ear lobes.
Dominant and recessive traits in humans
Rolling of Tongue:

If you can roll the lateral edges of your
tongue together, then this means you
have inherited a dominant trait. Those
who are unable to do so are expressing
inheritance of recessive gene for tongue
rolling.
Dominant and recessive traits in humans
Cleft Chin:

People who have a cleft chin have
inherited a dominant gene and
those with smooth chin have
recessive gene.
Dominant and recessive traits in humans
Dimples:

Have you fallen for the cute
dimples of Brad Pitt? Well, Brad
Pitt and people all over the world
with dimples are expressing the
dominant gene for dimples.
Whereas, people without dimples
have recessive genes
Dominant and recessive traits in humans
Handedness:

 The gene for right-handedness is
 dominant and the gene for left
 hand is recessive. Thus, majority of
 the people have inherited the
 dominant gene resulting in right-
 handedness.
Dominant and recessive traits in humans
Natural Curly Hair:

   The gene for naturally curly hair
   is dominant and the gene for
   straight hair is recessive. (Does
   this mean I have one dominant
   and one recessive gene that
   resulted in my wavy hair?
   Interesting.)
Dominant and recessive traits in humans
Freckles:

All those with freckles, you have
inherited at least one pair of
dominant gene for freckles. Those
without freckles have inherited two
recessive genes for freckles.
Dominant and recessive traits in humans
Allergies:
 People with allergies may have inherited
 the gene for allergy from at least one of the
 parent. It is seen that a parent with
 allergies has a chance that one of four of
 their children may develop allergy. The
 chances of child inheriting allergy from a
 parent is about 25% and the risk increases
 if both parents have allergies
Dominant and recessive traits in humans
Color Blindness:
Color blindness is a genetic disorder
that is seen due to presence of a
recessive allele located on the X
chromosome. There are two X
chromosome in women and one of
them usually carries an allele for
normal vision. In men, there is only one
X chromosome and if they carry an
allele for color blindness, they will
express this trait. This is the reason that
more number of men are colorblind as
compared to women
Dominant and recessive traits in humans
These were just a few
dominant and physical traits
in humans. Other dominant
and recessive traits in humans
include:
Dominant Trait in Humans   Recessive Trait in
Humans
A blood type                O blood type
Abundant body hair          Little body hair
Astigmatism                 Normal vision
B blood type               O blood type
Baldness (in male)         Not bald
Broad lips                 Thin lips
Broad nose                 Narrow nose
Dwarfism                    Normal growth
Hazel or green eyes         Blue or gray eyes
High blood pressure         Normal blood pressure
Large eyes                  Small eyes
Migraine                    Normal
Mongolian Fold              No fold in eyes
Nearsightedness            Normal vision
Rh factor (+)               No factor (Rh -)
Second toe longest         First or big toe longest
Short stature              Tall stature
Six fingers                 Five fingers normal
Webbed fingers             Normal fingers
Tone deafness               Normal tone hearing
White hair streak           Normal hair coloring
Dominant and recessive traits in humans

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Dominant and recessive traits in humans

  • 3. There are over 200 traits that are transmitted from generation to generation in humans. These interesting aspects of human genetics are known as hereditary traits
  • 5. There are two or more variations in most of the genes called alleles. An individual can inherit same pair of alleles or two different pairs of alleles. When there are two different alleles, they are expressed in a different way. The trait that is expressed in case of two different alleles, gives rise to the dominant and recessive traits in humans. When a dominant allele is present, it is always observed that the dominant trait is expressed. The recessive trait is observed only in case there are two recessive alleles present.
  • 6. Common Dominant and Recessive Traits in Humans:
  • 7. Widow's Peak: The widow's peak allele is dominant and the straight allele is recessive.
  • 8. Bent Pinkie: You can try to bend your pinkie finger inwards towards your ring finger or fourth finger. If you are able to do so, it means you have inherited the dominant version of the gene that causes the distal segment of the pinkie to bend.
  • 10. Crossing of Thumbs: Do you find your left thumb crossing your right thumb? If yes, then you probably have inherited 1 or 2 copies of the dominate gene. In case of 2 recessive genes inherited, you will find your right thumb placed over your left thumb.
  • 12. Earlobe Attachment: Some people have their ear lobes attached to the side of the head and some people have free ear lobes. This is due to a gene that is dominant for unattached ear lobes and recessive in case of attached ear lobes.
  • 14. Rolling of Tongue: If you can roll the lateral edges of your tongue together, then this means you have inherited a dominant trait. Those who are unable to do so are expressing inheritance of recessive gene for tongue rolling.
  • 16. Cleft Chin: People who have a cleft chin have inherited a dominant gene and those with smooth chin have recessive gene.
  • 18. Dimples: Have you fallen for the cute dimples of Brad Pitt? Well, Brad Pitt and people all over the world with dimples are expressing the dominant gene for dimples. Whereas, people without dimples have recessive genes
  • 20. Handedness: The gene for right-handedness is dominant and the gene for left hand is recessive. Thus, majority of the people have inherited the dominant gene resulting in right- handedness.
  • 22. Natural Curly Hair: The gene for naturally curly hair is dominant and the gene for straight hair is recessive. (Does this mean I have one dominant and one recessive gene that resulted in my wavy hair? Interesting.)
  • 24. Freckles: All those with freckles, you have inherited at least one pair of dominant gene for freckles. Those without freckles have inherited two recessive genes for freckles.
  • 26. Allergies: People with allergies may have inherited the gene for allergy from at least one of the parent. It is seen that a parent with allergies has a chance that one of four of their children may develop allergy. The chances of child inheriting allergy from a parent is about 25% and the risk increases if both parents have allergies
  • 28. Color Blindness: Color blindness is a genetic disorder that is seen due to presence of a recessive allele located on the X chromosome. There are two X chromosome in women and one of them usually carries an allele for normal vision. In men, there is only one X chromosome and if they carry an allele for color blindness, they will express this trait. This is the reason that more number of men are colorblind as compared to women
  • 30. These were just a few dominant and physical traits in humans. Other dominant and recessive traits in humans include:
  • 31. Dominant Trait in Humans Recessive Trait in Humans A blood type O blood type Abundant body hair Little body hair Astigmatism Normal vision B blood type O blood type Baldness (in male) Not bald Broad lips Thin lips Broad nose Narrow nose Dwarfism Normal growth Hazel or green eyes Blue or gray eyes High blood pressure Normal blood pressure Large eyes Small eyes Migraine Normal Mongolian Fold No fold in eyes Nearsightedness Normal vision Rh factor (+) No factor (Rh -) Second toe longest First or big toe longest Short stature Tall stature Six fingers Five fingers normal Webbed fingers Normal fingers Tone deafness Normal tone hearing White hair streak Normal hair coloring