Download Pedigree Charts

Punnett Review
• Determine the probability for a
child to be male or female. Give
the genotype and phenotype of
the offspring.
• Mom: XX Dad: XY
50% male
50% Female
Pedigree Charts
Learning Targets
• I can interpret pedigree charts
to analyze inherited family traits
or genetic diseases.
“You’re a wizard Harry!”
• We’re going to read the following excerpt from
Harry Potter.
• You need to be reading along and listening to the
story.
Ask yourself…
• INDEPENDENTLY, (yes,
that means silently and
to yourself) What do you
think the excerpt from
Harry Potter has to do
with pedigrees?
• To answer, think about
what you may already
know about pedigrees.
With your partner
• You have 20 seconds to discuss
with your partner how you think
the excerpt can be linked to
pedigrees.
• Be ready to share your
thoughts!
What is a pedigree
chart?
• Pedigree charts are used to show
records of families or individuals.
• They are used because breeding humans
is not possible. Shows ethical ways of
studying human genetics.
• Shows how possible conditions may be
inherited.
• Uses symbols to represent the
individuals and their relationships to
each other
Complete the think map on
“What are Pedigree Charts”
your SISN.
Please copy down the
various symbols that are
used.
• The half filled circles and squares
show the carriers of the disorder
• This shows that the
disorder/condition is carried by the
females but expressed in the males.
• This is called a Sex – Linked
condition.
• Here we see a family with 5 children.
• The pedigree chart shows that the second
son is affected by the condition.
• Below is a pedigree of 4
generations – 20 people.
• Generations are identified by
Roman numerals.
Confused still? Maybe
this will help!
•
http://www.schooltube.com/video/c188ce8266b54a18992b/
What is Hemophilia?
• Hemophilia is a condition when
blood can't clot properly, excessive
bleeding (external and internal)
occurs after any injury or damage.
• Symptoms include many large or
deep bruises, joint pain and
swelling, unexplained bleeding, and
blood in urine or stool.
Hemophilia
• The X and Y chromosomes are
called sex chromosomes. The
gene for hemophilia is carried
on the X chromosome.
Hemophilia is inherited in an Xlinked recessive manner.
Take 5 minutes to
complete the practice
notes below.
Muggle or Magic?
Task to Complete:
1.Complete the Harry Potter
pedigree practice
2.Complete exit ticket
3.Turn both in

Extra Pedigree Practice
• Is the condition Sex linked or not?
• Study the following pedigree
chart. How is this disorder
inherited? Write in the genotypes
for each individual.
Study the following pedigree chart. How is
this disorder inherited? Write in the
genotypes for each individual.
Study the following pedigree chart. How
is this disorder inherited? Write in the
genotypes for each
individual
Is the trait dominant or recessive?
Is the trait dominant or recessive?
Who are the possible carriers?