5. The gene controlling the human ABO blood group system has three alleles that determine the nature of the antigens on the membranes of red cells. Allele lª codes for the production of antigen A on the surface of red blood cells. Allele IB codes for the production of antigen B on the surface of red blood cells. Allele lº does not code for any antigens on the surface of red blood cells. Alleles IA and IB are co-dominant and both alleles are dominant over lº a. Use this information to determine the possible genotypes, antigens and blood group phenotypes within a population. Genotype Antigen(s) Blood Group Phenotype

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Inheritance and Mendelian Genetics

Inheritance means the passing of traits to offspring from parents. These traits could be passed either through asexual reproduction or sexual reproduction. The offspring receives the genetic material from the parents. Mendelian inheritance is a certain biological inheritance that follows the rules and principles laid down by Gregor Mendel in 1865. The initial hypothesis was considered wrong, but other inheritance theories modified the concept of inheritance and thus genetics.