Waec Biology Past Questions and Answers

Question 296:

• WAEC 1993

One of the major criticisms against ‘Mendelian laws is that they do not recognize that

A. One trait is often controlled by many pairs of genes
B. Single factor inheritance is never a reality
C. Complete dominance is always possible
D. Incomplete dominance is not possible
E. Hybrids exist in living organisms

Question 297:

• WAEC 1993

Identical twins inherit their genes from

A. The same ovum and different sperms
B. The same sperm and different ova
C. Different sperms and many ova
D. The same ovum and the same sperm
E. Many ova and many sperms

Question 298:

• WAEC 1993

The offspring produced when pure strains interbreed is described as

A. Dominance
B. Phenotype
C. Allele
D. Genotype
E. Hybrid

Question 299:

• WAEC 1993

Which of the following diseases or disorders can be prevented by the application of the knowledge of
heredity through marriage counselling?

A. Sickle cell anaemia
B. Haemophilia
C. Diabetes mellitus
D. Colour blindness
E. River blindness

Question 300:

• WAEC 1993

Study the genetic cross above showing the inheritance of blood groups from the cross above which of the following F offspring does not
belong to the father?

A. AA
B. AO
C. OB
D. OO
E. AB