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Flashcards · Biology · Inheritance

Codominance and ABO Blood Groups

16 cards

  1. What are the four ABO blood groups?

    A, B, AB and O.

  2. How many alleles are there for the ABO gene?

    Three: \(I^A\), \(I^B\) and \(i\).

  3. How many ABO alleles does one person have?

    Two.

  4. What is codominance?

    When both alleles show their effect in a heterozygous person.

  5. What are multiple alleles?

    When a gene has more than two alleles in a population.

  6. What is the genotype of blood group AB?

    \(I^A I^B\).

  7. What is the genotype of blood group O?

    \(ii\).

  8. What genotypes give blood group A?

    \(I^A I^A\) or \(I^A i\).

  9. What genotypes give blood group B?

    \(I^B I^B\) or \(I^B i\).

  10. Which alleles are codominant?

    \(I^A\) and \(I^B\).

  11. Which allele is recessive?

    \(i\).

  12. What is the chance of group O from \(I^A i\) x \(I^B i\)?

    1 in 4 (25%).

  13. Can a group AB parent and a group O parent have a group O child?

    No. The AB parent has no \(i\) allele.

  14. Which blood group is the universal donor?

    Group O.

  15. Give an example of codominance other than blood groups.

    Roan cattle, with red and white hairs.

  16. What is the common mistake about ABO inheritance?

    Thinking that there are only two alleles. There are three in the population.