Waec Biology Past Questions and Answers

Question 1776:

• WAEC 2018

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

A. OO
B. AO
C. BO
D. AA

Question 1777:

• WAEC 2018

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

A. Undergone an agglutination test
B. Been asked for the blood group
C. Been screened for HIV
D. Undergone malaria test

Question 1778:

• WAEC 2018

The greatest contribution to genetic studies was made by

A. Gregor Mendel
B. Thomas Morgan
C. Charles Darwin
D. Robert Hooke

Question 1779:

• WAEC 2018

The exchange of genes between homologous chromosomes is called

A. Crossing over
B. Back cross
C. Test cross
D. Mutation

Question 1780:

• WAEC 2018

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?

A. P
B. Q
C. S
D. R