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Questions and Answers
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?
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?
- 50% (correct)
- 75%
- 100%
- 25%
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?
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?
- 75%
- 25% (correct)
- 100%
- 50%
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 woman with blood type O (genotype OO) has a child with blood type AB, what are the possible genotypes of the father?
- AA and BO
- BB and AO
- AO and BO (correct)
- BB and AB
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?
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?
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?
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?
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?
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?
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?
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?
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Study Notes
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
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