Take the Blood Type Quiz: Learn About Genetics

What is the chance of a child with blood type AB if a man with blood type A (genotype AO) marries a woman with blood type B?

When a person with blood type A (genotype AA) marries a person with blood type AB, what is the probability of having a child with blood type B?

If a woman with blood type O (genotype OO) has a child with blood type AB, what are the possible genotypes of the father?

If a man with blood type B (genotype BB) marries a woman with blood type AB, what is the likelihood of their child having blood type O?

When a man with blood type A (genotype AA) has a child with blood type O, what is the possible genotype of the mother?

In the scenario where both parents have blood type AB (genotype AB), what are the possible blood types of their children?

If a person with blood type O (genotype OO) marries someone with blood type A, what is the probability their child will have blood type B?

When a couple with blood types B and AB (genotypes BB and AB) have a child with blood type A, what does this suggest about the paternal genotype?

If a person with blood type A (genotype AO) has a child with blood type O, what could be the possible genotype of the other parent?

When two individuals both have blood type A but their child is born with blood type B, what does this reveal about the parents' genotypes?

Mendelian Genetics Review

Dominant and recessive alleles: one allele is dominant over the other, "masking" the recessive allele
Genotype: PP (homozygous dominant), pp (homozygous recessive), Pp (heterozygous)
Phenotype: purple (dominant), white (recessive)
Ratio of genotypes: 1:2:1
Ratio of phenotypes: 3:1

Incomplete Dominance

A third phenotype appears in the heterozygous genotype, blending the dominant and recessive phenotypes
Example: Red (R) and White (r) alleles result in a pink (Rr) phenotype
Genotype ratio: 1:1
Phenotype ratio: 1:1

Codominance

Both alleles are expressed equally in the heterozygous genotype, with no blending
Represented by using 2 different capital letters
Example: Black (B) and White (W) alleles result in a speckled black and white phenotype (BW)
Sickle Cell Anemia: NN (normal), SS (sickle cell), NS (carrier)

Codominance Examples

Speckled Chickens: BB (black), WW (white), BW (black and white speckled)
Rhododendron: R (red flowers), W (white flowers)
Roan Cattle: RR (red), WW (white), RW (roan)
Appaloosa Horses: GG (gray), WW (white), GW (Appaloosa)

Blood Types

ABO Blood Typing: determined by antigens on the surface of red blood cells
Blood groups: A, B, AB, O
ABO Blood Groups: A (A antigen), B (B antigen), AB (A and B antigens), O (no antigens)
Plasma Antibodies: A (anti-B), B (anti-A), AB (no antibodies), O (anti-A and anti-B)
Rh Factor: a separate gene that determines Rh+ or Rh- status
Rh+ individuals: Rh+Rh+ or Rh+Rh-
Rh- individuals: Rh-Rh-

ABO Blood Type Problems

Problem 1: chance of a child with group O blood
Problem 2: determining if Archibald can be the father of Cinderella's child
Problem 3: chance of a child with group A blood

Test your knowledge on blood types, genetics, and blood transfusions. Learn about codominance, multiple alleles, antigens, antibodies, and blood group vocabulary.

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