Transcript MM - Cobb Learning

Ahh!
Can’t We
Just Watch
The Movie?
Well, what if we use a movie to
help understand heredity and
genetics?
But what film should we use?
Harry Potter
and the
Recessive
Allele
How Are Wizards
Made?
How Are Wizards Made?
Being a wizard or a muggle is all
decided by genetics
All humans including
wizards receive one
allele from each parent
Muggleness
• Being a muggle is a dominant trait,
represented by M. To be a muggle, you
must have inherited an M from one of your
parents. The allele options could be MM
or Mm. If you have the M, you will have
the dominant trait.
Wizards
The allele for wizarding ability is: (m)
Wizards have
the alleles
(m m)
Muggles
• The allele for
Muggleness is (M)
• Muggles have the
alleles (M m) or (M M)
• (M) is dominant to (m)
• Wizards only have (mm)
The
Malfoys
Narcissa Malfoy
(m m)
Lucius Malfoy
(m m)
Draco Malfoy
(mm)
W
The Malfoys are a ‘pure blood’ family
All their ancestors are wizards so they must have the alleles (m m)
The
Potters
James Potter
(m m)
Lily Potter
(m m )
Harry Potter
(m m)
Both Harry’s parents had magical ability so they
must both have been (m m)
They passed these alleles on to Harry
The Weasleys are pure blood wizards so they
all have the alleles ( m m )
Hermione is a Powerful Witch.
Therefore, she must be (m m).
(Mm
)
(Mm
)
(m m)
However, both her parents are muggles so they
must be (M m) so they can give her a (m) allele each.
Tom Riddle is a ‘half blood’.
His mother was a witch (m m) and his father was a muggle
His father must have had the alleles (M m) so he could give him
the other m allele
(m m)
(M m)
(m m)
Filch is a ‘Squib’
Both his parents are (m m) so he should be too because he
can’t get an (M) allele from either parent but he can’t do any
magic
This means he has a mutation
so his wizarding powers don’t
work or the man he thinks is his
father is not truly his father.
His natural father must
be a muggle!
What Wizarding Alleles Would
Ron and Hermione’s Children Have?
Ron
(m m)
Hermione
(m m)
Children
(mm)
Their children
could only get the
(m) allele from
both parents so
they would all be
wizards
Ron
m
m
m
mm
mm
m
mm
Hermione
mm
What Wizarding Alleles Would Ginny and Dudley’s
Children Have If Dudley is (M m)?
Ginny
(m m)
Dudley
(M m) or (m m)
(M m) or
(MM)
Half of their children
would be likely to
get the w allele
from both parents
so they would be
wizards
The other half would
be likely to get an
(M) allele from
Dudley and would
be muggles
Ginny
Dudley
m
M
m
mm
Mm
m
mm
Mm
But what if Dudley
was pure muggle
(M M)?
Their children would
get the w allele from
Ginny and the (M)
allele from Dudley
so they would all be
muggles
Ginny
Dudley
M
M
m
Mm
Mm
m
Mm
Mm
What wizarding alleles would you
expect Hermione’s brothers and
sisters to have?
The Granger’s children have a
1 in 4 chance of getting (m)
alleles from both parents and
having magical ability
Mr Granger
They also have a 1 in 4 chance of
getting (M) alleles from both
parents and being a muggle
They could also
get only one
(m) from their
Mrs
mother or father Granger
and still be a
muggle
m
M
m
mm
Mm
M
Mm
MM
Congratulations!
You are now an expert
on Wizard Genealogy.