Biology

Codominance is a form of inheritance in which two different alleles for a gene are both expressed, and neither allele is dominant over the other. The alleles for type A blood and type B blood are codominant. If a man who is homozygous for type A blood and a woman who is homozygous for type B blood have children, what would you expect to find in the children? (2 points)


Half will have type A and half will have type B blood.

The children will all have type B blood.

The children will all have type AB blood.

The children will all have type A blood.

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  1. Since Jiskha doesn't have a biology expert at this time, please try posting your question at this site.

    http://www.biology-online.org/biology-forum/

    In addition, be sure to make really good use of Khan Academy!
    http://www.khanacademy.org/science/biology
    Choose from the general topics at the right and then find the specifics you need within each topic.

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    Writeacher
  2. Codominance means both are expressed in the presence of each other. If there is one allele of each, then both A and B will be expressed (giving AB type).
    If either an A allele is paired with a different one, such as O, then the dominance is expressed and the resulting blood type is A. Similar phenomenon with B.

    Since one parent is homozygous with A type (i.e. AA) and the other is homozygous with B type (i.e. BB), then the children will always have an A allele and a B allele,giving AB blood type in all cases.

    The above reading recommendations from Writeacher are excellent. In particular, read up on sickle cell anemia alleles. It is even more interesting.

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