Download 4/20 & 4/21 - 7th Grade Agenda

2/29 - 7th Grade Agenda
Learning Objective: Learn about Genetic Disorders
Collect HW: Reading & Note taking p. 102 – 103
Counselor Presentation
Text Book Reading: 195 – 200
HW: Reading & Note taking p. 104 – 106
Reminder HW: Science Fair Project due 3/3 & 3/4 (50
Points)
Reflection
• Prompt: What are the 4 major blood types
for humans? Which blood type is the
universal donor blood type? Why?
Some human traits are
controlled by a single gene that
has more than two alleles
• Blood type is controlled
by three Alleles
• What are the major
human blood types?
• A, B, AB & O
• Which human blood type
is a universal donor?
• Blood Type: O
Many human traits are controlled
by many genes
• Four genes control height in humans
• Skin, eye and hair color are controlled by
multiple genes
What are the Female Sex
Chromosomes?
• XX
What are the Male Sex
Chromosomes?
• XY
• Because there is
some missing genetic
information in the “Y”
chromosomes, Males
are more likely to get
a sex-linked trait
Who determines whether the
child is a boy or a girl ?
• Father
How many pairs of
chromosomes to humans have?
• 23
Sex Linked Genes
• Genes on the X and Y chromosomes are
called sex linked genes
• Most of the genes on the X chromosomes
are not on the Y chromosomes
• Since Males have the Y chromosomes
they are missing an allele.
Red – Green colorblindness
• More males have red – green color blindness
then females
• Why?
Red – Green colorblindness
Red – Green colorblindness
Genetic Disorders – Cystic
Fibrosis
• Cystic Fibrosis is a
disorder in which the
body produces
abnormally thick mucus
in the lun___
gs and
intes_____.
tines
• The thick mucus fills
the lungs making it hard
for the affect person to
breathe.
Genetic Disorders – Sickle Cell
Disease
• Sickle shaped red
blood cells clog blood
vessels and cannot
carry as much
ox_____
ygen as normal
cells.
Genetic Disorders – Hemophilia
• People with
Hemophilia do not
produce one of the
ein needed for
prot_____
normal clotting.
• They can die from
simple cuts and
bruises
Genetic Disorders – Down
Syndrome
• In Down syndrome, a
person’s cells have
an extra copy of
osome 21
chrom______
• People with Down
syndrome have some
degree of mental
retar________
dation