Passing of Traits by mikesanye

VIEWS: 160 PAGES: 12

									Passing of Traits
                  Traits
 Traits are the set of characteristics that an
  organism inherits from it’s parents.
 Traits are determined by the genetic
  material that is passed from parents to
  offspring.
 An organism’s genetic material (DNA) is
  contained in the cells that make up that
  organism.
         Examples of Traits
    Physical Traits          Hereditary
                              Disorders
   Eye color
                         Sickle cell anemia
   Eye shape
                         Down’s Syndrome
   Hair color
                         Huntington’s disease
   Type of hair
                         Marfan’s syndrome
   Freckles
                         Dwarfism
   Nose
                         Hemophilia
   Thumb
                         Colorblindness
         Passing of Traits
 Scientists who study
  the passing of traits
  are called
  geneticists.
 Geneticists use
  Pedigree charts to
  study the passing of
  traits through a
  family to determine if
  a particular trait is
  going to show.
         Pedigree Charts
 To the right is a
  Pedigree chart.
 A pedigree chart is
  very much like a
  family tree.
 Pedigree charts are
  like a map of where
  particular traits have
  come from.
     Pedigree Charts (cont’d)
 The squares
  represent males
  and the circles
  represent females.
 Horizontal lines
  between a circle
  and a square
  indicate a couple
  who has
  reproduced.
       Pedigree Charts (cont’d)
   In this pedigree
    chart, the red
    colored circles and
    squares indicate
    the individuals
    whom have the
    trait being
    examined.
 What have you learned so far?
In this Pedigree, how
    many children did
    the first couple
    have?
A. 5
B. 6
C. 8
D. 9
 What have you learned so far?
In this Pedigree, how
    many grandchildren
    do the first couple
    have
A. 8
B. 9
C. 10
D. 19
 What have you learned so far?
In this Pedigree, how
    many of the first
    couple’s children
    had children?
A. 1
B. 2
C. 3
D. 4
E. 5
 What have you learned so far?
In this Pedigree, the
    child highlighted
    received its
    affected gene
    from its’
A. Mother’s mother
B. Mother’s Father
C. Father’s Father
D. Father’s Mother
  What have you learned so far?
In this Pedigree, what is the
    reason the indicated
    child does not show the
    affected trait?
A. Because the child is a
    boy.
B. Because the child is a
    girl
C. Because the mother
    didn’t give the trait to the
    child
D. Because the father didn’t
    give it to the child.

								
To top