Waec Biology 1993 Past Questions and Answers

Question 46:

• WAEC 1993

The table below indicates the result of an experiment during which grains of different colours in two maize cobs were counted

Maize cob	White	Pink	Red
I	30	60	30
II	50	99	49

Which of the following ratios agrees with the result?

A. 9:3:3
B. 1:2:1
C. 1:3:1
D. 2:1:1
E. 2:3:2

Question 47:

• WAEC 1993

One of the factors that must be considered for safe blood transfusion is

A. Social class of the donor
B. Age of the recipient
C. Rhesus factors of the donor and the recipient
D. Nationality of the donor
E. Weight of the recipient

Question 48:

• 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 49:

• 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 50:

• WAEC 1993

The offspring produced when pure strains interbreed is described as

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