JAMB Biology Past Questions & Answers - Page 331

1,651.

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

Correct answer is B

No explanation has been provided for this answer.

1,652.

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

A.

characters are linked

B.

characters are not linked

C.

parents are related

D.

parents are not related

Correct answer is A

No explanation has been provided for this answer.

1,653.

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

Correct answer is C

No explanation has been provided for this answer.

1,655.

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 haemophilic

B.

all their daughters will be haemophilic

C.

All their daughters will be carriers

D.

all their sons will be carriers

Correct answer is C

No explanation has been provided for this answer.