The ABO blood group system follows an autosomal codominant inheritance pattern with one allele (O) being recessive. The gene is located on chromosome 9, an autosome. The A and B alleles are codominant to each other, meaning if an individual inherits both (genotype A/B), both are fully expressed, resulting in the AB phenotype. Both the A and B alleles are dominant over the O allele. Therefore, genotypes A/A and A/O both result in phenotype A, and genotypes B/B and B/O both result in phenotype B. The O allele is recessive, so phenotype O only occurs with the homozygous recessive genotype O/O. This pattern explains why, for example, two parents with type A blood (who could both be A/O) can have a child with type O (O/O).

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Zambia

• Joseph Soko – 101 pts

• Visual Pathway Lesions
• Positive and Negative Symptoms
• Hallucinations and Delusions
• Antipsychotic Medications
• Emergency: Environmental Emergencies