Biology Past Questions and Answers

Two unconscious patients X and Y whose blood group genotypes are AO and AB respectively were transfused with the blood from the same donor . Patient X immediately showed signs of difficulty in breathing while patient Y showed no negative reaction.


Patients X and Y were likely transferred with blood of genotype

Two unconscious patients X and Y whose blood group genotypes are AO and AB respectively were transfused with the blood from the same donor . Patient X immediately showed signs of difficulty in breathing while patient Y showed no negative reaction.


What should the hospital have done to prevent X from showing the symptom described above? Patient X should have

The greatest contribution to genetic studies was made by

The exchange of genes between homologous chromosomes is called

The diagrams above are illustrations of the inheritance of coat colour in mice. J, K, L, M and N are parents. The cross between two parent mice gave rise to offspring P, Q, R and S. Which of the offspring are all homozygous?