Question 626:

• JAMB 1989

when the two alleles present in an organism are of the same type, the genotype is described as

A. Heterozygous
B. Heterogamous
C. Homozygous
D. Homologous

Question 627:

• JAMB 1989

If parents with blood groups AB and O produce six children

A. Three of them will have group B
B. Two of them will have group A
C. All the offspring will have group O
D. None of them will have group A

Question 628:

• JAMB 1989

Which of the following is a sex-linked character?

A. Sickle-cell anaemia
B. Tongue rollling
C. Skin colour
D. Colour blindness

Question 629:

• JAMB 1989

In an ecosystem, the LEAST efficient energy transfer link is from

A. Producers to primary consumers
B. Sun to producers
C. Primary consumers to secondary consumers
D. Secondary consumers to decomposers

Question 630:

• JAMB 1989

Lichen is an example of

A. Saprophytic organism
B. A symbiotic association
C. An epiphytic plant
D. A carnivorous plant