Download Blood Types

Comp book
Open your comp book to pg. 51 to take
notes.
Set up your notes Cornell style.
Remember: The best notes are notes that
you organize on your own. Try not to copy.
EQ: What are the
genotypes and
phenotypes of blood
type?
Genetics of Blood
Your blood type is part of
your genes, like your hair
color or eye color.
Your father gives you 1
chromosome with 1 blood
type allele.
Your mother gives you 1
chromosome with 1 blood
type allele.
Alleles
•There are 3 alleles for blood type:
–A
–B
–O
Dominant & Recessive
• O is recessive
• A is dominant
• B is dominant
Genotypes
•There are 3 alleles for blood type:
–A
–B
–O
•So, there are 6 possible genotypes:
– AA
– AO
– BB
– BO
– OO
– AB
Genotypes & Phenotypes
Genotypes
Phenotypes
AA
Type A
AO
Type A
BB
Type B
BO
Type B
OO
Type O
AB
Type AB
Genotypes & Phenotypes
Some blood types have certain types of antigens on the surface of the
cells.
Co-dominant
Blood type is a co-dominant gene.
There are 3 kinds of genes:
-Complete dominance (like the B & b traits we’ve
been learning – Your earlobe is either attached or it’s not)
-Incomplete dominance (Some genes blend
together; you’ll learn about these in high school or college –
A red flower and a white flower make seeds for pink flowers)
-Codominance
(more than one dominant allele
exists, and they can both show up together – A blue fish and
red fish have babies that are both blue and red)
Co-dominant
Codominance - more than one dominant allele exists, and
they can both show up together
A & B are both dominant. O is recessive.
A + B = Type AB
but
A + O = Type A
Try it!
Dad has Type B blood type
(phenotype) because he has a B
gene and an O gene genotype.
Mom has
Type A blood
because she
has an A gene
and an O gene
Try it!
Dad has Type B blood type
(phenotype) because he has a B
gene and an O gene genotype.
B
Mom has
Type A blood
because she
has an A gene
and an O gene
A
O
O
Try it!
Dad has Type B blood type
(phenotype) because he has a B
gene and an O gene genotype.
Mom has
Type A blood
because she
has an A gene
and an O gene
B
O
A
AB
AO
O
BO
OO
Try it!
Dad has Type B blood type
(phenotype) because he has a B
gene and an O gene genotype.
Mom has
Type A blood
because she
has an A gene
and an O gene
AB (Type AB) = 25%
AO (Type A) = 25%
BO (Type B) = 25%
OO (Type O = 25%
B
O
A
AB
AO
O
BO
OO