Transcript Sex-Linked Traits Slideshow

A Little History…
King Henry VIII
King Henry VIII Story
Born: 28 June 1491, Greenwich Palace
Father: King Henry VII
Mother: Elizabeth of York
Reigned: 1509 - 1547
Died: 28 January 1547
King Henry VIII
The 6 wives of
King Henry VIII
1) Catherine
of Aragon
(divorced)
2) Anne Boleyn (beheaded)
3) Jane Seymour
(died after giving
birth)
4) Anne of Cleaves (divorced)
5) Catherine Howard
(beheaded)
6) Catherine Parr
(survived)
The wives of King Henry VIII
Catherine of Aragon - divorced
Anne Boleyn - beheaded
Jane Seymour - died
Anne of Cleaves - divorced
Catherine Howard - beheaded
Catherine Parr - survived
Moral:
Don’t anger the King.
Why was the
King angry
with his wives?
Sex is determined
by males!
Technically it was
his own fault…
Write a summary of
the King Henry VIII
Story.
(~3 Sentences)
46 Chromosomes in every body cell
44 Chromosomes are autosomal
2 chromosomes code for sex
Sex Chromosomes
Male = XY
Female = XX
Don’t copy this slide.
A
gene
a
Q
gene
q
f
gene
F
XX
marries
XY
XX
X
marries
XY
XX
X
marries
XY
XX
X
X
XY
marries
Y
XX
X
XY
marries
X
Y
Girl
Boy
In DNA, what
matches with “A”?
In DNA, what
matches with “G”?
3 billion
base
pairs in
a body
Don’t copy this.
Chromosome
Color Blindness
is a sex-linked recessive
condition
Sex-linked means
X-linked!
Males
N
X Y = Normal
n
X Y = affected
Females
N
N
X X = Normal
N
n
X X = Carrier
n
n
X X = affected
Ishihara Test for
Color Blindness
Normal color vision
should have seen a “5”.
Red/green color
blindness should have
seen a “2”.
Hardy-Rand-Rittler Test
Try to find a circle, square, star
and/or boat in the next couple of
pictures.
Normal vision should see
the yellow and “faint”
brown objects.
Color Blind people
Hemophilia = recessive
and X-linked
Males
N
X Y = Normal
n
X Y = affected
Females
N
N
X X = Normal
N
n
X X = Carrier
n
n
X X = affected
N
X X
N
n
X Y
N
N
X X
N
X
n
X Y
N
N
n
X X
n
X
N
X
X Y
N
N
n
X X
n
X
N
X
X Y
Y
N
N
n
X X
X Y
Y
n
X
N
N
X X X
n
N
X Y
n
X Y
Can a hemophiliac
father pass his bad
allele to his son?
n
X Y
NO!
He passes the bad
allele to his daughters!
Hemophilia
n
X Y
n
X
Daughter
Y
Son