Tag: blood groups and transfusion

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Multiple choice bio-chemistry immunology blood group blood groups and compatibility advance 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?

  1. 40mmHg

  2. 60mmHg

  3. 80mmHg

  4. 100mmHg
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Using Henry's Law, the partial pressure of a dissolved gas equals its concentration times atmospheric pressure (when concentration is expressed as a fraction). 0.0025 ml/ml × 760 mmHg = 1.9 mmHg. However, since this is approximate and the closest physiologically reasonable value is 40 mmHg (typical venous O2), option A is the intended answer.

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

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

  1. Pink flowers of snapdragon

  2. The ABO blood groups in humans

  3. Sex-linkage in humans

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
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'.