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Blood Type
• Trait controlled by multiple alleles
• Alleles are A, B, and O
Genotype
Phenotype
AA AO BB BO AB OO
A
A
B
B AB O
1. Which alleles are dominant?
A, B over O
O
A and B
2. Which alleles are recessive?
3. Which alleles are codominant?
Blood
type
A
B
AB
O
A
B
AB
O
Can
receive
from:
Blood
type
Can
donate to:
Blood Type Problems
1. Bob has A type blood and Emily has B
blood. Their child has O blood.
–
–
Identify the genotypes of all 3 people.
Calculate the probability that Bob and Emily
will have a AB child.
2. Raul has A blood. Raul and his wife
Isabel have a child with AB blood.
•
Identify the possible genotypes of all three
Blood Type Problems
3. Leo has B blood type. His wife Sherri has AB
blood. Half of their children have AB blood,
and half of their children have B blood.
–
What is Leo’s genotype?
4. If Leo and Sherri’s child, Roxy, gets in an
accident and loses a lot of blood, which parent
can donate blood to Roxy, who has AB blood.