Chromosomal Disorders

1
Chromosomal Disorders

• Non-Disjunction

2
Non-Disjunction

• During Meiosis, chromosomes do not separate
  properly. The result is gametes with too many or
  too few chromosomes.

3
Meiosis
X Y
X X
YY
Y
Y
X
X
4
Meiosis
X Y
X X
YY
YY
X
X
5
Meiosis
X X
X X
X X
X
X
X
X
6
Meiosis
X X
X X
X X
X X

X
X
7
Normal Fertilization
Y
X
XY
8
Turners Syndrome
X
X0
9
Super Woman
XX
X
XXX
10
Klienfelters Syndrome
XX
Y
XXY
11
Jacobs Syndrome
YY
X
XYY
12
Down Syndrome21st Pair of Chromosomes
XX
X
XXX
13
Down Syndrome21st Pair of Chromosomes