Blood groups

• How many potential blood types do humans have?

  Four potential blood types
• What are the four blood types in humans?

  A, B, AB, and O
• What are the three different alleles for the blood type gene in humans?

  I^A, I^B, and I^O
• What does it mean for I^A and I^B to be codominant?

  Both alleles express equally in AB blood type
• What blood type results from the genotype I^AI^O?

  Blood type A
• When do you get blood type O?

  With genotype I^OI^O
• How can you predict blood groups using genetic diagrams?

  • Draw genetic diagrams for codominant alleles
  • Predict potential phenotypes from genotypes
  • Understand allele interactions for phenotype expression
• What are the genotypes of a man with blood group A and a woman with blood group B?

  Man: I^AI^O; Woman: I^BI^O
• What does the Punnett square show in this example?

  Possible genotypes and phenotypes of offspring
• How many different blood groups can the child have from the given parents?

  Four different blood groups
• What is the probability of the child having each blood group?

  25% chance for each blood group
• How many alleles can an individual have for a gene?

  Two alleles, one from each parent
• How can a mother with blood group A and a father with blood group B have a child with blood group O?

  Both parents carry I^O allele