Question

Blood grouping in human beings is controlled by
A. 4 alleles in which A is dominant
B. 3 alleles in which A and B are codominant and i recessive
C. 3 alleles in which none is dominant
D. 3 alleles in which A is dominant

Answer 1

Hint:- Blood groups were discovered at the University of Vienna by Karl Landsteiner in 1900 and 1901. He was belatedly awarded the Nobel Prize in 1930 for his study and discovery of blood types. For the ABO blood community, both humans and many other primates can be listed. There are four forms of principal: A, B, AB, and O.

Complete answer:
The type of human blood is determined by codominant alleles. An allele is one of the different types of genetic information that is found on a particular chromosome at a particular position in our DNA. For human blood groups, there are three distinct alleles, known as IA, IB, and i. We can call these alleles A (for IA), B (for IB), and O (for i) for simplicity.
IA and IB are the dominant alleles and i is the recessive allele. Since we each inherit one blood type allele from our biological father and one from our biological mother, each of us has two ABO blood type alleles. The genotype is called a definition of the pair of alleles within our DNA. As three different alleles occur, there are a total of six different genotypes at the genetic locus of the human ABO. AA, AO, BB, BO, AB, and OO are the various probable genotypes.
One of their two ABO alleles is donated by each biological parent to their infant. Only an O allele may be transmitted to her son or daughter by a mother who has blood type O. A father who is of the blood type AB could transfer to his son or daughter either an A or a B allele. This couple may have children with either form A (mother's O and father's A) or type B (mother's O and father's B) blood.
So, the correct answer is option (B).

Note:- The genetic material of the Rh factor is also inherited from our ancestors, but it does not depend on the ABO blood type alleles, it is inherited. The Rh factor, classified as Rh+ and Rh-, has 2 different alleles. There is at least one Rh+ allele in someone that is "Rh positive" or "Rh+," although they could have two. Either Rh+/Rh+ or Rh+/Rh- may be their genotype. Someone who has Rh- has the Rh-/Rh-genotype.