Tag: blood groups and transfusion

Questions Related to blood groups and transfusion

One intern calculated the concentration of $O _2$ in blood as 0.0025 ml/ml of blood. Considering atmospheric pressure as 760 mmHg, how much approx. $O _2$ tension could have been in the blood?

bio-chemistry immunology blood group blood groups and compatibility advance blood groups and transfusion

  1. 40mmHg

  2. 60mmHg

  3. 80mmHg

  4. 100mmHg

Show answer
Correct Option: A

Choose the correct answer from the alternatives given.
Which of the following is an example of codominance?

bio-chemistry immunology blood group blood groups and compatibility advance blood groups and transfusion

  1. Pink flowers of snapdragon

  2. The ABO blood groups in humans

  3. Sex-linkage in humans

  4. None of these

Show answer
Correct Option: B
Explanation:
  • Pink flowers of Snapdragon is a heterozygote phenotype and an intermediate phenotype of the two homozygous phenotypes from which it originates. It is an example of incomplete dominance.
  • Codominance is seen when both the alleles are expressed simultaneously and neither of the alleles is dominant over the other. In human ABO blood grouping system both the alleles I$^A$ and I$^B$ are codominant and hence in the AB blood group individuals both the antigens, A and B are seen. So, the human ABO blood grouping is an example of codominance.
  • The expression of the sex chromosomes in humans differ in males and females and hence are said to be sex-linked.
So, the correct option is 'The ABO blood groups in humans'.