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Codominance : ABO blood group - Principles of Inheritance and Evolution, Biology, Class 12 Video Lecture

FAQs on Codominance : ABO blood group - Principles of Inheritance and Evolution, Biology, Class 12 Video Lecture

1. What is codominance and how does it apply to the ABO blood group?

Ans. Codominance is a genetic concept where both alleles of a gene are fully expressed in the phenotype of an individual. In the case of the ABO blood group, there are three alleles: A, B, and O. The A and B alleles are codominant, which means that if an individual inherits both A and B alleles, they will have blood type AB. The O allele is recessive, so if an individual inherits an O allele along with an A or B allele, they will have blood type A or B, respectively.

2. How are the principles of inheritance and evolution related to the ABO blood group?

Ans. The principles of inheritance explain how traits, such as the ABO blood group, are passed down from parents to offspring. The ABO blood group is determined by the inheritance of specific alleles from both parents. Evolution, on the other hand, refers to the change in inherited characteristics in a population over generations. The ABO blood group system is believed to have evolved through natural selection, with certain blood types providing advantages in different environments.

3. Are there any other blood group systems apart from the ABO blood group?

Ans. Yes, apart from the ABO blood group, there are several other blood group systems, such as the Rh system, the Kell system, the Duffy system, and many more. These blood group systems are based on different antigens present on the surface of red blood cells. Each system has its own set of alleles and inheritance patterns.

4. Can a person's blood type change over time?

Ans. No, a person's blood type does not change over time. The ABO blood group is determined by the alleles inherited from parents, and these alleles remain the same throughout a person's life. However, it is important to note that blood type can be affected by certain medical conditions or procedures, such as bone marrow transplantation, where the recipient may acquire the blood type of the donor.

5. How is the ABO blood group used in blood transfusions?

Ans. The ABO blood group is crucial in blood transfusions to ensure compatibility between the donor and recipient. It is important to match the blood types to avoid adverse reactions. The transfusion of incompatible blood types can lead to the clumping of red blood cells, known as agglutination, which can be life-threatening. For example, individuals with blood type A can receive blood from type A or type O donors, while individuals with blood type B can receive blood from type B or type O donors. Individuals with blood type AB can receive blood from any blood type, while individuals with blood type O can only receive blood from type O donors.

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Jan 16, 2025 Last updated

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