Jamb Biology 1992 Past Questions and Answers

Question 41:

• JAMB 1992

Which of the following is true of the children of a heamophilic man who marries a woman that is not haemophilic and does not carry the trait?

A. All their sons will be haemophlic
B. All their daughters will be haemophilic
C. All their daughters will be carriers
D. All their sons will be carriers

Question 42:

• JAMB 1992

A child with blood group genotype different from those of both parents and with a mother of genotype OO, can only have a father of genotype

A. A
B. B
C. AB
D. OO

Question 43:

• JAMB 1992

If R and r, denotes the genes for a character, the offspring of the cross between RR and Rr are

A. RR, 2Rr, rr
B. 2RR, 2rr, 2rr
C. 2RR, 2Rr
D. 4Rr

Question 44:

• JAMB 1992

A mammal with red fur and long ears was crossed with another having white fur and short ears. If the offspring had a red fur and short ears, the

A. Character are linked
B. Character are not linked
C. Parents are related
D. Parents are not related

Question 45:

• JAMB 1992

Pawpaw seeds collected from a tree with many desirable agronomic qualities did not give rise to plants of desirable character as the parent because

A. Seeds are not reliable for propagating plants
B. Uncontrolled out-crossing can introduced unwanted variability
C. Vegetative propagation is best form of reproduction of all crop
D. Seeds were not physiologically mature at the harvest