STARTER
• Each pair will be given a card with a key term on
it
• As a pair you have to come up with a definition
AND an illustration and write it onto the card
• Have the card checked
• Staple it to the Genetics Word Wall
Blood Type Genetics
In traits with multiple alleles, each individual
can carry any two of the several possible
alleles.
Ex. BLOOD TYPE
The gene for blood type has 3 possible
alleles.
Blood Group Genes
• There is 1 gene for blood type
• There are 3 alleles for blood type:
A, B, & i (O).
• A&B are codominant and both dominant
to i (O).
The ABO blood system
Genotypes
Phenotypes (Blood types)
IA IA
IA IB
IA i
IB IB
IB i
ii
A
AB
A
B
B
O
Note:
• Blood types A and B have two possible genotypes –
homozygous and heterozygous.
• Blood types AB and O only have one genotype each.
How blood types work….
How common are the 4
blood types?
4%
11%
45%
40%
http://www.lanecountyblood.org/images/other/bloodfacts.j
pg
http://learn.genetics.utah.edu/units/basics/blood/types.cfm
Group Practice Problem:
1. A mother is IA IB and a father is ii. Draw the
punnett square.
IA
IB
i
i
What is the probability their offspring will have A
type blood?
Can they have an offspring with O blood?
Practice Problems:
1. A mother is IA IB and a father is ii. Draw the
punnett square.
i
i
IA
IA i
IA i
IB
IB i
IB i
What is the probability their offspring will have A type blood?
50%
Can they have an offspring with O blood? No
STARTER
• A woman has a heterozygous genotype for blood group
B. She is expecting a baby with a man who is
homozygous Group A. What are the possible blood
groups for their baby?
I. Group O
II. Group A
III.Group AB
A.
II and III only
B.
I and II only
C.
I and III only
D.
I, II and III
Rh Factors
• Scientists sometimes study Rhesus monkeys to learn
more about the human anatomy.
• While studying Rhesus monkeys, a certain blood
protein was discovered.
• This protein is also present in the blood of some
people. Other people, however, do not have the
protein.
• The presence of the protein, or lack of it, is referred to
as the Rh (for Rhesus) factor.
• If your blood does contain the protein, your blood is
said to be Rh positive (Rh+).
• If your blood does not contain the protein, your blood
is said to be Rh negative (Rh-).
http://www.fi.edu/biosci/blood/rh.html
A+ AB+ BAB+ ABO+ O-
ARGHGH – can you save a life today!
Now have a go at the blood typing
problems!