Question
Download Solution PDFA man of blood type A married a woman of blood type B, they had a child of type AB. What does this mean in terms of genetics?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFThe correct answer is Both the gene for blood type A and the gene for blood type B are dominant.Key Points
- The gene for blood group A is dominant and the gene for blood group B is recessive.
- This means that if a person has one gene for blood group A and one gene for blood group B, they will express the A phenotype because the A gene is dominant.
- The child having blood type AB indicates that they inherited one gene for A from the father and one gene for B from the mother.
- The A and B genes are codominant, which means that when they are both present, they both express themselves equally.
- If both the gene for blood type A and the gene for blood type B are inactive, then the person would have blood type O, which is the absence of A and B antigens on the surface of red blood cells.
- If both the gene for blood type A and the gene for blood type B are dominant, then a person with that genotype would have blood type AB, which is the codominant expression of both antigens.
Additional Information
- Blood type is determined by the presence or absence of specific antigens on the surface of red blood cells.
- The ABO blood group system is based on the presence or absence of two antigens: A and B.
- A person with blood type A has the A antigen on their red blood cells, while a person with blood type B has the B antigen.
- A person with blood type AB has both A and B antigens, while a person with blood type O has neither A nor B antigens.
- The Rh factor is another antigen that can be present on red blood cells, and its presence or absence determines whether a person is Rh positive or Rh negative.
Last updated on Jun 30, 2025
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