Variation In Population - Jamb Biology Past Questions and Answers

Question 1:

• JAMB 2019

A plant which grows on another plant without apparent harm to the host plant is called

A. An epiphyte
B. A saprophyte
C. A parasite
D. A predator
E. A hermaphrodite

Question 2:

• JAMB 1978

In a breeding program a cross was made between two true breeding cow-pea types: one with round seeds and the other with wrinkled seed. If roundness is dominant why wrinkleness is recessive, in the first filial generation all the seeds produced will be

A. 25% wrinkled, 75% round
B. 100% wrinkled
C. 50% wrinkled, 50% round
D. 75% wrinkled, 25% round
E. 100% round

Question 3:

• JAMB 1979

If you cross breed a tall variety (Tt) of maize with a short variety (tt), the ratio of tall to short plants in the offspring will be

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

Question 4:

• JAMB 1982

If a tall man (TT) maries a dwarf woman (gg) and they have four male children, the offspring will be

A. All short
B. Three short and one tall
C. Two short and two tall
D. One short and three tall
E. All tall

Question 5:

• JAMB 1992

Woman do not suffer from colour blindness because

A. The trait is sex-linked
B. Only men are colour blind
C. The genes are recessive and sex-linked
D. The genes occur on both the X and Y chromosomes