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. one example of codominance is blood type in humans; 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? half will have type a and half will have type b blood. the children will all have type b blood. the children will all half type a blood. the children will all have type ab blood.