Multiple Allelism ABO Blood System CoDominance Principles of Inheritance Genetics NEET EAMCET

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Understanding the ABO Blood Group System: Multiple Allelism and Codominance • The ABO blood group system is a fascinating example of multiple allelism and codominance in genetics. Unlike simple dominant and recessive inheritance, the ABO system involves three different alleles: A, B, and O. These alleles determine your blood type, and their interactions provide a clear illustration of these genetic principles. • Multiple Allelism • In genetics, multiple allelism occurs when more than two alleles are present for a particular gene. For the ABO blood group system, there are three possible alleles: • A allele: Codes for the A antigen on the surface of red blood cells. • B allele: Codes for the B antigen on the surface of red blood cells. • O allele: Does not code for any antigen; it's essentially a null allele. • Each person inherits one allele from each parent, and the combination of these alleles determines their blood type. There are four possible blood types: • Type A: Has A antigens on red blood cells and anti-B antibodies in the plasma. This can result from inheriting AA or AO genotypes. • Type B: Has B antigens on red blood cells and anti-A antibodies in the plasma. This can result from inheriting BB or BO genotypes. • Type AB: Has both A and B antigens on red blood cells and no anti-A or anti-B antibodies in the plasma. This occurs with an AB genotype. • Type O: Has no A or B antigens on red blood cells and has both anti-A and anti-B antibodies in the plasma. This results from an OO genotype. • Codominance • Codominance is a genetic scenario where both alleles contribute equally and visibly to the organism's phenotype. In the case of the ABO blood group system, codominance is illustrated by the AB blood type. Individuals with the AB genotype express both A and B antigens on their red blood cells simultaneously. Neither allele is dominant or recessive; instead, both A and B antigens are equally and fully expressed. • This means that if you inherit the A allele from one parent and the B allele from the other, both types of antigens will appear on your red blood cells. This unique combination demonstrates codominance, where both alleles are actively expressed and contribute to the phenotype. • In summary, the ABO blood group system is a prime example of how multiple allelism and codominance operate in genetics. It shows how different alleles interact to produce various blood types and highlights the complexity of inheritance beyond simple dominant-recessive relationships. • Unlocking #Genetics: #ABO Blood #Groups #Multiple #Allelism #Explained! • ABO Blood Group System: A Simple Guide to Multiple Allelism • The Magic of Multiple Alleles: #Understanding ABO Blood Types • ABO Blood Groups Demystified: A #Lesson in Multiple Allelism • Genetic Diversity in Your Blood: Exploring ABO Blood Groups • How Multiple Alleles Shape Your Blood Type: The ABO System • ABO Blood Types: The Fascinating World of Multiple Allelism • Cracking the Code: How Multiple Alleles Determine Your Blood Type • ABO Blood Group System 101: A Dive into Multiple Allelism • Multiple Alleles at Work: The #Science Behind ABO Blood Types • #intermediate #seinor #junior #1styear #2ndyear #genetics

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