HEREDITY AND VARIATIONS - Jamb Biology Past Questions and Answers

Question 1:

• JAMB 2019

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

Question 2:

• JAMB 2019

The carrier of the hereditary character in plants and animal is the

A. Nucleus
B. Chromosome
C. Chloroplast
D. Cell
E. Gene

Question 3:

• 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 4:

• JAMB 1979

The carrier of the hereditary character in plants and animal is the

A. Cell
B. Nucleus
C. Chromosome
D. Chloroplast
E. Gene

Question 5:

• 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